explain the process of expansion of gases
Answers
Explanation:
Expansion, in physics, increase in volume resulting from an increase in temperature. Contraction is the reverse process. When heat is applied to a body, the rate of vibration and the distances between the molecules composing it are increased and, hence, the space occupied by the body, i.e., its volume, increases. This increase in volume is not constant for all substances for any given rise in temperature, but is a specific property of each kind of matter.
Expansion of gases
We can explain this topic with the help of an experiment.
Take an empty test tube and fit its mouth with a cork with a hole. Take a drop of a colored liquid into a narrow bored glass. Fit this glass tube in the hole in the cork so that the drop of liquid can be seen above the cork. Now, heat the test tube and carefully observe the colored drop, We observe that the colored drop moves upwards.
The air in the test tube expands on heating. Thus, it pushes the drop in the glass tube upwards. The colored drop falls back to its original place when heating is stopped. Thus, we can conclude that most of the substances in solid, liquid, or gaseous state expand when heated and contract when cooled.
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