[50]
Is it true that cool air sinks and warm air rises?

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True

False

answer is A.

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Detailed Solution

The above statement is true.
In higher temperatures, the density of air decreases as compared to cool air, and the gravitational force is higher for higher density objects or particles that cool air sinks and warm air rise up. As the molecules heat and move more quickly, they go apart. Air expands as it is heated and shrinks when cooled, like the majority of other substances. The air is less dense than the surrounding substance as there is more space between the molecules, and hot air rises upward. In hot air balloons, the burner heats the air, causing it to expand and become less dense, causing the balloon to rise through the heavier, cooler surrounding air.

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