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A regulation Basketball is inflated to a pressure of 7.5 to 8.5 pounds per square inch (psi), which is the standard air pressure for most basketballs.
Air pressure affects the bouncing of a basketball by inflating or deflating it. Higher air pressure makes a basketball bouncier, resulting in more bounces, while lower air pressure reduces the ball's bounce. The correct air pressure for a basketball is usually around 7.5 to 8.5 pounds per square inch (psi).
Air pressure in an NBA basketball can be measured using a pressure gauge designed for basketballs. The recommended range for an NBA basketball is typically between 7.5 and 8.5 pounds per square inch (psi) when measured with the gauge. It is important to check and adjust the air pressure regularly to ensure optimal performance.
15 lbs of air pressure
That has nothing to do with properties of air. "Low pressure" means there isn't much pressure, it's as simple as that.
the number of molecules changes