Question

- Why are the changes of states temporary?
. What do you understand by the terms expansion and contraction ?​

Answer 1

Answer:

-The changes of states are temporary because it can be converted to any other states.

-Substances expand ( increase in size ) when they get warmer, and they contract ( decrease in size ) when they get cooler.

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Answer 2

Substances expand (increase in size) when they get warmer, and they contract (decrease in size) when they get cooler. This property can be useful. For example: Thermometers work because the liquid inside them expands and rises up the tube when it gets hotter.