when the air expands,it
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When the air expands, it becomes thinner due to the atomic collision decreases. ' This is the reason air becomes thinner during the expansion time.
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Air is made up of molecules that are constantly in motion. As air warms up, the molecules start to vibrate and bump into each other, increasing the space around each molecule. Because each molecule uses more space for motion, the air expands and becomes less dense (lighter).
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