How to check basketball air pressure

How Much Air Pressure Should a Basketball Have to Bounce Properly?

Are you a regular basketball player that’s puzzled about why some basketballs bounce better than some others? Yeah right! So, you’re quick to conclude that the bouncing ability of the ball depends on the brand that produces it.

Thus, you think a Spalding is better than a Nike, Franklin, Champion Sports, MacGregor or Fanmats? And some other basketball players think otherwise—choosing the brand they love above others.

It’s typical for you to be biased and support your favorite brand as the best basketball manufacturer in the market. On that note, it will interest you to know that the brand has nothing to do with the bouncing deficiency of your basketball.

But here’s what we found out.

The amount of air pressure in your basketball contributes majorly to the bounce rate of your basketball.

We‘ll be talking extensively, in this article, about how much air pressure your basketball should have—for it to bounce correctly. Also, we would discuss other vital factors that contribute to the air pressure and bounce rate of a basketball.

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What Happens When a Basketball Isn’t Bouncing Properly?

The obvious answer, right? If your basketball isn’t bouncing correctly, the first issue it creates is to hinder your game performance. But, beyond that, we need to go deep into the foundation of this problem and find out why your basketball isn’t bouncing correctly.

If you’re like us that recently found out that the amount of air pressure in a basketball determines its bounce level, then, we’re on the same page. But, if you haven’t, it is not too late to join the bandwagon.

Dealing with Air Pressure

The force that pushes air against every solid surface it comes in contact with is the air pressure. In simpler terms, the more air in an enclosed area, the higher the air pressure. If this theory is correct, that means you need an optimum amount of air in your basketball to get the best bouncing result on the court.

Before we move on:

Did you know that air is mattered? You heard, right! The air we breathe? Of course! But, you’re surprised because you have always thought that matter in quote had to be solid. At least, that’s what your science teacher taught you in mid-school—she told you, “Matter is anything that has got mass and occupies space.”

But here’s the cracker.

Air has weight, mass, and volume (You can ask your science teacher). What that means is air takes up space. So, you can see it fits into the definition. We know, it sounds weird to think of air as matter, when you can’t touch or run into it.

Think of it this way. Your basketball, bike tire, bouncing castle or air mattress get their mass and form because of the air and air pressure in them. In this case, it’s the air pressure in your basketball that gives your ball the round shape and bouncy feel.

Recommended Air Pressure Required for a Basketball to Bounce Optimally

The typical basketball requires at least a reading of 8 lbs(pounds by square inch) to get appropriately inflated. If you’re lucky enough, you can buy a basketball that has the inflation instructions printed by the manufacturer to help you get the default air pressure of the ball.

If your ball is not far from you now, you can quickly go check it out and come back to the article. For instance, you may see something like “Inflate 7 to 9 psi.” You saw that, right? Don’t bother if you didn’t see it on your ball—not every manufacturer prints it on their basketballs.

NBA recommends that the air pressure in a basketball must be between 7.5 and 8.5psi. You can use this standard measurement as a guide to get the required air pressure for your basketball.

A quick way to check if your ball has the proper air pressure is by taking this simple test. Drop your basketball from the height of your shoulder and leave it to bounce. If it bounces up back to the height of your hips, then your ball probably has the appropriate air pressure required to deliver on the court.

Three Factors That Can Affect the Internal Air Pressure of a Basketball

Here are three primary factors that affect the bounce level of your ball.

1. Ball Pressure

When you properly inflate your basketball, you enhance its elastic bladder—making it capable of rebounding when it hits a hard surface like the rim. In essence, the higher the air pressure in your basketball, the higher its bounce and otherwise. But, you have to be wary not to over-inflate your basketball to avoid the bladder breaking, which will negatively impact the consistency of the ball’s bounce or even cause leakage.

2. Environmental Pressure

Most times, the surrounding air pressure around a basketball is equally constant, but you should always consider environmental air pressure as it always comes in play—affecting the bounce level of the basketball.

The air is usually less dense or thinner at higher altitudes. And when the air is less dense, objects aren’t still affected as much by the air resistance going against them—whether they fly or bounce through the air.

What this means is that air pressure from the surroundings will hardly affect your basketball enough to mar your game outdoors. However, it contributes significantly to the height of your ball’s bounce. That takes us to the next factor.

3. Temperature

A decrease in temperature will result in a decline in air pressure inside your basketball. Plus, the bounce level of a basketball primarily depends on the air pressure inside a basketball—as we discussed earlier.

Thus, when a basketball hits and bounces on the floor of a gym with average room temperature, the force of the bounce impact pushes the bottom surface of the ball while compressing the gas inside it.

But here’s a kicker.

According to Boyle’s law, the pressure of the gas inside the basketball increases, when a ball bounces on a hard surface, especially when you’re playing at the park during summer.

But, it’s a different ball game in winter. The internal air pressure of a basketball decreases when it bounces on a hard surface.

Since the internal air pressure of the basketball decreases at a lower temperature, the impact of the ball with the ground will also have less effect when it hits the ground. By that, the basketball does not bounce high enough as it does at a higher temperature.

In Closing

It’s wise to use a small pump and pressure gauge when inflating your basketball. A report showed that you need about 12 strokes to get something close to the perfect air pressure, which is around 7.5 – 8.5psi.

Thus, you should avoid using high-pressure pumps designed for cars and bike tires. They can easily over-inflate and destroy your basketball.

Of the three factors mentioned earlier in this article, which one struck you as the most important? Has that factor affected your game before? Have you damaged your ball previously because of over-inflation? Tell us your story; we’re eager to see your comments, suggestions, and feedback.

How to Inflate a Basketball (What You Need + 5 Steps)

Inflating a basketball is not something you really need to do all that often. When you buy a brand new basketball, it is usually already inflated so you really don’t think too much about it. After a while, basketballs tend to lose a little air and if you let one sit around for a long time, it will definitely end up flat.

Even an often used basketball will eventually need air. You may go out to play a game and notice that your ball is not bouncing quite as it should. Cold weather may also lower the pressure in a basketball making it seem unresponsive when you dribble and shoot. In either case, you can always add a little air to solve the problem.

Why should you care if your basketball is properly inflated? How do you know when your basketball is properly inflated? What is the best way to properly inflate your basketball? These are all common questions with fairly simple answers. Let’s take a look at each question one at a time.

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Why Should I Properly Inflate My Basketball?

A properly inflated basketball will ensure that your practice, one-on-one game, full-court five-on-five game or even your game of HORSE is the best experience that it can be. An underinflated ball will not have any “action”, meaning it will not bounce very well, which will make it more difficult to dribble. Also, it will not bank off the backboard as well and bounce passes will not go as far as you intend them to go.

An overinflated ball can be bad as well. It will bounce too high when you dribble, bank too hard off the backboard and bounce passes will go farther than you intend them to go. This is why it is important to have your basketball inflated to the specified pressure or at least near the specified pressure.

How Do I know If My Basketball is Properly Inflated?

The standard pressure recommended for a basketball is 7 – 9 PSI (48.26 – 62.05 kPa). Unless you have a pressure gauge, and many air pumps do (we’ll talk about that in the next section), then you will not know what the air pressure in your basketball is. Not to worry, there is a simple method that you can use to check the inflation of your ball. It won’t give you the PSI (or kPa), but it will be good enough to get you back out on the court.

1. Hold the basketball at about the level of your face.
2. Drop the basketball.
3. Let the ball bounce.
4. If the ball is properly inflated, it should bounce back up to around your waist level.

Another great way to tell is just by playing with the ball and dribbling it. You can often tell if it is under or over-inflated. Different players prefer various levels of inflation, so an ideal inflation level to one player may be too much or not enough to others. An interesting thing to do next time you watch a game or attend one live is to watch which players walk over to the referee before tip-off and test the ball by grabbing it and dribbling.

What’s the Best Way to Properly Inflate a Basketball

I have seen many videos and instructions out there on the internet that explain how to inflate a ball without the proper equipment. While these methods may or may not work, it is always best to use the proper equipment because you can ensure that you are inflating the basketball to the correct pressure. Using the proper equipment will also help prevent you from damaging your basketball.

Let’s take a look at what you will need to properly inflate your basketball.

What You Will Need

Inflation Needle

These are relatively cheap and can be found at almost any store that carries any type of athletic equipment. They can also be found easily online.

See the picture below if you are not familiar with what they look like.

Inflation Needle. Photo by Melissa Medina.

Air Pump

There are many different types of air pumps. Below are a few types that can be used such as a hand pump, a bicycle pump or an electric pump. Basically, you need a basketball pump that can connect to the needle. Some air pumps come with built-in pressure gauges which can show you the air pressure as you are inflating the ball. You can also use an air compressor but that can be a little more complicated depending on the type of compressor and the connectors available.

Three types of air pumps.

Air Pressure Gauge (optional)

If your air pump does not have an air pressure gauge, you may want to get a separate air pressure gauge to check the pressure in your ball. Air pressure gauges can be found online or in stores, but as we mentioned above they are optional and not necessary to inflate your basketball.

Don’t have a needle? Also read this article: how to pump a basketball without needle

Steps to Inflate Your Basketball

Step 1: Attach the inflation needle to the air pump.

How to attach the needle will depend on the type of air pump you are using. Most hand pumps made for a basketball will be threaded and you can screw needle onto the pump. If you are using a bicycle pump, it will probably have a connector with a latch (see below). You must put the needle into the connector and tighten the latch to hold the needle in place.

Attach the needle to the pump.

Attach the needle to the pump.

Electric air pumps may have the same type of latch, but a big industrial compressor may need some type of adapter and I wouldn’t recommend using an industrial compressor unless you really know what you are doing.

Step 2: Moisten the inflation needle.

Get a wet paper towel and wipe the needle to moisten it. If you don’t have a wet paper towel, you can run it underwater or even spit on it. The moisture allows the needle to slide into the valve easier and prevents damage to the valve. If the valve is damaged it can cause your basketball to leak air.

Step 3: Insert the needle into the valve.

Once the needle has been moistened, slowly insert it into the valve of the basketball until the needle is all the way in the valve.

Insert the needle into the valve of the basketball.

Step 4: Begin inflating.

If you are using a hand pump or a bicycle pump you will need to manually pump the air in. If you are using an electric pump or a compressor you can turn it on. WARNING! When using an electric pump or a compressor, monitor the inflation at all times. The ball will fill very quickly and if overfilled it can pop and destroy the ball.

Step 5: Check the air pressure.

Monitor the air pressure as you are inflating. Use one hand on the ball as you are inflating it to feel the pressure rise. If your pump has an air pressure gauge, check it regularly. If it does not use a separate gauge or check it using the bounce method described above.

Once the air pressure seems good, get out there on the court and start having fun!

Additional Resources

There are many types of air pumps on the market. Take a look at some of the following if you are interested.

• Basic Hand Pump with needles and gauge
• Bicycle Pump
• Electric Pump

If you would like to see how to inflate a basketball using an air compressor, check out this video.

Final Words

Eventually, all basketballs will need to be inflated because they will lose air over time. Fortunately, the process is fairly simple as we have shown above and the equipment needed is relatively cheap. So, if you want to have an enjoyable game of basketball, make sure your basketball is always properly inflated, then get out there and have some fun!

Have you ever tried to play basketball with an under-inflated or over-inflated basketball? We’d love to hear from you, so please leave your comments.

Ball inflation pressure

Ball inflation pressure

A properly inflated ball is the key to a good game and durability. If the ball is not sufficiently inflated, then this will entail a low rebound, poor handling, and an incorrect flight path. If the ball is pumped over, it can burst, change shape, cause pain during the game, and even cause injury.

First of all, when buying, carefully check the ball for mechanical damage, whether the ball is new and how it is packaged. Most often, the cause of the pressure drop in the ball is a damaged nipple. If you purchased the ball in a deflated state, then be sure to inflate it according to the instructions, checking the pressure, and leave the ball overnight. Check the pressure again the next day. If you bought the ball in an inflated state, then leave it for a day and see if it went down during this time. You can also use the "old Russian way" to determine the health of the nipple. To do this, moisten your finger and attach to the nipple. A properly functioning nipple will not form bubbles. We draw your attention to the fact that if you purchased the ball and used it, then the guarantee for such a ball remains only after the provision of an expert opinion.

Back to pressure... The pressure in a ball depends on what sport the ball is for, what size it is, and what level of play it is. Different manufacturers measure pressure in different units, psi (pounds per square inch), bar (pressure unit approximately equal to one atmosphere), kgf / cm² (one kilogram of force per square centimeter), kPa (kilopascal). Pay attention to this!

The pressure in the ball is strongly influenced by the ambient temperature and atmospheric pressure. If we recall physics, then at high temperatures the substance expands, and at low temperatures, on the contrary, it decreases. So if, in winter, we pump up the ball on the street at -10 to the desired pressure, then after we bring the ball into a warm room, the pressure in it will increase slightly. This is true, for example, for soccer balls for games in winter. Therefore, it is better to inflate the ball directly where games or training are planned. If the operating pressure recommended by the manufacturer is not observed, the performance of the ball will be significantly worse and the ball will become unusable very quickly.

Below are tables with average operating pressures for balls of various sizes and for various sports:

Pressure balls for classic volleyball

Beach Volleyball Pressure

Futsal pressure

Football pressure

Pressure in handballs

Pressure in basketballs

IMPORTANT! These tables are for reference only and may not meet the requirements of some manufacturers. As a rule, the manufacturer always indicates the working pressure of the ball at the nipple. Be sure to check this information.

We also recommend that you purchase and use a special silicone liquid for inflating sports balls with the ball and have a pressure gauge to check the pressure. Do not use liquids that destroy the material (latex, butyl) of the camera.

Effect of air pressure on ball bounce height

• Authors
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Chernyshev G.S. 1

1GBOU School 2120

Vagidova Z.R. 1

1GBOU School 2120

The author of the work was awarded a diploma of the winner of the III degree

Diploma of a student Certificate of the head

The text of the work is placed without images and formulas.
The full version of the work is available in the "Files of the work" tab in PDF format

Introduction

The ball is one of the most favorite toys for boys of all ages. There are many ball games such as football, volleyball, basketball, golf. Each game has its own ball. We know that there is air inside any ball. Therefore, the question arises: why don't all balls bounce?

Relevance: the ball is one of the most important attributes of games. Knowing the properties and types of balls helps in choosing them. Each person should have an idea about the physical phenomena and laws that he directly encounters in everyday life from childhood.

The purpose of is to study the effect of ball pressure on the height of the jump on the height of the first bounce.

Object is a basketball.

Item - air pressure in the ball.

To achieve this goal, it was necessary to solve a number of tasks:

1. Collect literature on the topic;

2. select research methods;

3. study the history of the origin of the ball, its varieties;
4. find out what sports games are played with the ball;
5. conduct an experiment explaining why the ball jumps to different heights after the amount of air in it changes;

6. draw conclusions.

Thanks to the following methods , a study was performed:

- work with Internet sources;

- work with literature;

- analysis;

- comparison.

Starting the study, we put forward the following assumption : if you release air from the ball, it will bounce lower.

Problem question of our study is: How does the amount of air in a basketball affect how high it bounces? How do basketball players determine how much air a basketball needs to have in order to play?

The novelty and practical significance of our study as a whole lies in the choice of the ball as the object of study.

1. Theoretical part.

1.1. Communication with history and science

In the encyclopedia "I know the world" it is said that the ball is one of the most ancient and favorite toys of all countries and peoples. In ancient Greece, it was considered the most perfect object, since it had the shape of the sun, which means (as the Greeks thought) it had its magical power. They sewed balls from leather and stuffed them with some elastic material, for example, moss or bird feathers. And later they guessed to inflate the leather ball with air. Such a ball was called "follis". Small follices were used for hand games, and large balls were used for games like football. Images of balls were found on the walls of Egyptian tombs, and during excavations of the burial places of the pharaohs, balls themselves were found, sewn from strips of leather or tree bark, and sometimes made of sandstone. The team games of the Egyptians with these items were dedicated to the gods, each team represented the interests of a group of celestials, the ball was driven into the gate with curved sticks. [1
And in ancient China they played ball, for example, by kicking it with their foot. The game eventually became a favorite folk entertainment, and in the 2nd century BC. included in the obligatory program of the solemn celebration of the birthdays of the emperor. At the same time, instead of stuffing with bird feathers and animal hair, they learned to fill leather balls with air, developed rules, and began to install gates on the playing field. The winners were honored with flowers, awarded with valuable gifts, and the losers were beaten with bamboo sticks.
In ancient Japan, too, they could not do without a ball. At the imperial court, team games were held to drive the ball into the goal for a certain time (measured by the hourglass), during the throw it should not touch the ground.
In Russia, the balls were different. In excavations near Novgorod, balls of various sizes were found, sewn from leather. They were played by children in the 13th century. Peasant children played with light balls made of birch bark or heavy balls tightly rolled from rags. Even information about one of the games has been preserved: they put chicken eggs in a row and knocked them out with a ball. In the Khotkovsky nunnery near Moscow, balls were sewn from soft pillows, and pebbles wrapped in birch bark were put inside - it turned out to be a ball and a rattle at the same time. By the way, the origin of the word "ball" is associated with the words "soft, pulp, crumb." That is, the ball is a soft ball.

Modern balls vary in size and purpose. Different balls are used for playing volleyball, basketball, football, tennis, water polo, rugby and other games.

Each of them has its own story. The name of the game of basketball came from the English words "basket" - "basket" and "ball" - "ball". This game was invented by D. Naismith, a sports instructor from one of the American universities, in 1891. At his direction, a large fruit basket was nailed under the ceiling of the sports hall and a ball was thrown into it. When the players got tired of climbing for the ball every time, it occurred to someone to just knock the bottom of the basket out. At first, basketball players used leather balls, and then switched to rubber ones.

The basketball must be spherical and must be the specified shade of orange with the traditional pattern of eight inlays and black stitching. The mass of the ball (officially accepted size 7) is 567-650 g, the circumference is 750-780 mm. Smaller balls are also used: in men's team games, "size 7" balls are used, in women's team games - "size 6", in mini-basketball matches - "size 5".

1. 2. Definition of concepts

Working with the dictionary of S.I. Ozhegov, we learned that a ball is an object for playing a solid or full ball made of an elastic material inside, which bounces off a hard surface upon impact. [2]

Pressure is a physical quantity equal to the ratio of the force acting perpendicular to the surface to the area of ​​this surface.

Pressure unit - Pascal (Pa). Using also other pressure units: hectopascal (hPa) and kilopascal (kPa) 1 kPa = 1000 Pa 1 Pa = 0.001 kPa 1 hPa = Pa 1 Pa = 0.01 hPa

The force arising in the body as a result of its compression and stretching (deformation) tending to return the body to its original position is called the elastic force.

According to the free encyclopedia "Wikipedia" elasticity is the property of solid materials to return to their original shape during elastic deformation. Solid objects will deform after a force is applied to them. [3]

Basketball size

First of all, when choosing a ball, you should pay attention to the size of the basketball. Size 7 means you are holding a ball that is suitable for men. Its weight can range from 567 to 650 grams. Size 6 is primarily used in the games of teenagers under 16 and adult women's teams. In addition to the circumference, its weight has also been reduced - from 510 to 567 grams. Size 5 is officially suitable for training and games of junior teams, with a weight of 470-500 grams. Of course, in your training you can use the size of the ball that you have at hand. By learning to handle a size 7, you are more likely to master a size 6 with ease. Unfortunately, the inverse doesn't always work.

2. Practical

In the practical part, we had to solve the following problems:

- determine how the height to which the basketball bounces changes when the air pressure changes in it;

- build a graph based on the received data;

- draw conclusions based on the data obtained.

Different manufacturers measure pressure in different units, psi (pounds per square inch), bar (pressure unit approximately equal to one atmosphere), kgf/cm² (one kilogram of force per square centimeter), kPa (kilopascal). In the United States of America, the pressure inside the ball is usually measured in pounds per square inch (lb/dm ² ).

We experimented with the amount of air in a basketball, but for measurement, we used units that are accepted in our country, namely kilopascals (kPa).

We measured the amount of air in a basketball and then used a distance sensor to measure how high the ball bounced.

Materials and equipment:

-Computer with Logger Lite installed on it;

-Go!Link adapter;

- Gas pressure sensor;

- distance sensor;

- Basketball;

- Stopper with needle, stem and tube;

-Measuring ruler.

Our experiment was carried out according to the following algorithm:

To configure the sensors for data collection, you need:

Check the connection of the distance sensor to the computer.

Set the distance sensor switch to position Normal .

Verify that the pressure transducer is connected to the adapter and that the adapter is connected to the computer.

Launch the Logger Lite program.

Open file for this experiment Air Ball (Air ball) .

Then did the following:

They took a basketball.

Zeroed the pressure sensor by pressing the Reset button on the toolbar. Next, the sensor measured the pressure in the same way as the measuring device on a bicycle pump.

Moistened the needle attached to the pressure transducer and inserted it into the ball.

Recorded data in the first line of the column "Actual pressure" of the data table.

Attached the distance sensor at a height of 2.3 m.

To collect data, did the following:

Hold the ball directly under the sensor so that the space between the ball and the sensor is about 15 cm.

Button pressed Data acquisition . Hearing the click of the sensor, they released the ball from their hands so that it hit the floor and bounced. No need to throw the ball with force!

Next, press the button View, to determine the position of the floor relative to the sensor and the distance to the ball at the top of the rebound ball #1. We recorded the obtained data in a table.

Next, we gradually reduced the pressure in the ball:

Moistened the needle attached to the pressure transducer and inserted it into the ball.

Watched the pressure reading on the screen.

Released some air.

Watch the pressure reading on the screen until it drops by 20 kPa (for the first time, the pressure will drop from 124.88 kPa to 105.79 kPa).

When the pressure dropped by 20 kPa, screwed the connection tip so that no more air escaped.

Recorded the value in the second line of the "Actual pressure" column of the data table.

Repeat steps 3-7 for 80 kPa, 60 kPa, etc. until you reach a test where the pressure was 5 kPa.

Data table (graphs are in the appendix):

Drop height 2.321 - ball distance 0.214 m = 2.107

Pins:

There is a pattern of change in the height of the rebounds with a decrease in pressure in the ball - the height of the rebounds decreases. The lowest air pressure in the ball allowed for playing basketball: 80 kPa.

Conclusion

What is basketball training without the main attribute of the game - a basketball? It is the basketball that gives us the opportunity to enjoy the gameplay in all its diversity.

Often when inflating a basketball, the question arises whether to inflate it more or less. We have to resort to the help of the Internet in search of information regarding this issue. We decided to answer the question, what is the optimal pressure should be in a basketball, since with the wrong level of pressure, the wear resistance of the chamber increases, which may simply not withstand and burst; there is a risk of injury; unpredictable flight path. The lowest air pressure in the ball allowed for playing basketball: 80 kPa.

Our study was carried out using Logger Lite software, Go!Link adapter, gas pressure sensor, distance sensor.

To achieve the goal, tasks were set that were successfully solved. To begin with, the literature on this topic was collected. Its analysis is presented in the theoretical part.

Getting to the practical part, we have defined research methods. Thanks to them, our study "The effect of air pressure on the height of the ball rebound" was carried out.

The hypothesis that we put forward at the beginning of the work was confirmed.

Having completed this study, we have developed a memo for fans of the game of basketball ( Appendix 2 ).

References:

I know the world. Sports: children. encyclopedia. - M.: AST: Astrel: Transitbook, 2006 - 382.

Ozhegov S.I. Explanatory Dictionary of the Russian Language, M .: LLC "A TEMP", 2008. p. 810

[Electronic resource] Access mode: Wikipedia - Head. from screen

[Electronic resource] Access mode: https://sportyfi.ru/basketbol/myach/kak-nakachat/ Head. from screen

Appendix 1

Experiment 1

Height

Pressure

Experiment 2

Height

Pressure

Experiment 3

Height

Pressure

Experiment 4

Height

Pressure

Experiment 5

Height

Pressure

Experiment 6

Height

Pressure

Experiment 7

Height

Pressure

Experiment 8

Height

Pressure

Annex 2

Instruction for inflating a basketball

Remember:

The pressure in the ball is quite strongly affected by the ambient temperature and atmospheric pressure.

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