Question

The given image can be related to which of the following phenomena?

A) Hot air rises up
B) Cold air settles down
C) Air has direction
D) None of the above

Answer 1

Air consists of different gases like carbon dioxide, oxygen, nitrogen, and water vapors. These all can be commonly known as molecules. When air is heated up, the molecules absorb the heat and result in the kinetic energy. The increase in kinetic energy results in the rise of hot air.

Complete answer:
When air is heated up, the air molecules absorb the heat and results in the increase of kinetic energy. Due to the increase in kinetic energy the hot air rises up.
When the bottle with a balloon placed in the hot water results in the heating up of air in the balloon. It results in the increase of kinetic energy. Thus, the balloon tied to the bottle placed in the hot water results in the rising up.
Thus, the given image can be related to the phenomena of rising up of hot air.

Therefore, Option A is the correct one.

Additional information:
Chemical compounds are commonly known as mixtures. Some of the examples of mixture are air. As air consists of carbon dioxide, oxygen, nitrogen, and water vapors. These all gases vary in their percentages like $21\%$ oxygen, $78\%$ nitrogen, $0.03\%$ carbon dioxide.

Note:
In the given image, one bottle was placed normally and the balloon did not rise up. While another one is placed in the hot water, it results in the rising up of hot air. Temperature is one of the factors that affects the speed of the molecules resulting in kinetic energy.