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Which phrase describes air pressure?

decreases with denser air
decreases as altitude decreases
equals mass divided by volume
decreases as a result of fewer air particles pushing down

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Answered by GPT-5 mini AI
"Decreases as a result of fewer air particles pushing down."

Brief explanation: air pressure is the force per unit area from collisions of air molecules. Fewer particles (or fewer collisions) → lower pressure. (Mass ÷ volume is density; pressure actually increases with denser air and increases as altitude decreases.)