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# Why does pumping more air into a basketball increase pressure inside the ball?

Updated: 10/20/2022

Wiki User

6y ago

The pressure is increased because more gas particles are added into the ball which crowds them, thus increasing the pressure.

Flossie Kozey

Lvl 10
2y ago

Wiki User

10y ago

As you pump more air into the ball, there are more and more molecules of gas in the ball. The increase in pressure causes the ball to expand slightly, but lets say the volume of the ball is constant for our purposes. The more gas molecules there are in the same amount of space (volume) the closer the molecules get to one another. The closer the molecules are the more strongly they repel one another. The more strongly the molecules repel, or push against one another, the stronger they push out on the inside surface of the ball. That push is what we call pressure. The mathematical representation of this is PV=NRT where P=Pressure, V=Volume, N=Number of particles or molecules, R=a constant you don't need to worry about if you are asking this question, and T=temperature. At a constant T, if N goes up, the product of PV must go up, so if you are in a fixed size container like a Basketball, V cannot change, so P must increase.