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As air fills the Basketball, the pressure expands outward to make the outside of the ball feel harder. The valve on the outside of the ball allows the pump to put air in prevents air from escaping.

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10y ago

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More answers

Pressure is the ratio of mass per volume. Adding more air (mass) into the fixed volume of the ball increases the pressure inside it. A basketball cannot expand much even when the pressure inside is higher than the outside air.

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Wiki User

13y ago
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The pressure increases, and the molecules collide with the ball's inner surface.

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15y ago
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shelby little

Lvl 1
4y ago
that's correct:) 

so that the air particles inside will move faster and the ball will be full.

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Wiki User

13y ago
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