Question

1. .............. Air is light and rises

Answer 1

Explanation:

Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. The less dense hot air then floats in the more dense cold air much like wood floats on water because wood is less dense than water.

Answer 2

Warm Air is light and rises upward. The cold air is heavy and it settles down as it is more  denser than the hot or warm air.

The explanation behind this is:

• When the air starting heats up the gases also starts to heat up and on heating the gases starts to expand.
• Density and temperature is oppositely symmetrical. The lesser the density of air, higher it rises on top of the less dense sir i.e., cooler air.
• Heat present in the earth, heats up the atmosphere and it leads the movement of molecules present in the air.
• Molecules present in the hot air moves faster, as the air is less dense and the molecules are loosely packed, which provide more space between the molecules and they can move freely.

Simply put, the warm air/hot air is less dense than the matter present in its surroundings and hence, it is light and rises upward.