What is thermal expansion ?

Question

Ok I have to write a paper about thermal expansion in solids,liquids, and gases. I don't understand it at all. Do they change states or what ? Please help !!!

Answer 1

I'll put it simply for you. As compounds heat up the molecules become unstable an loose bondind to each other. Hence expansion occurs. Different elements however have different thermal expansion coeffiecints.

Answer 2

When something gets warm it expands. You've seen this - if the lid of a jar is on too tight, you run it under hot water to make the metal expand a bit so it loosens on the jar.

Solids, being more compact, expand less than liquids.
Gases, being more diffuse, expand more than liquids.
The "ideal gas law" helps to estimate a gas's expansion.

A solid doesn't change to liquid unless the temperature rises to the material's melting point, and a liquid doesn't change to a gas unless the temperature rises to the material's boiling point.

Think of water. As ice (a solid) it takes up less room than as a liquid (water). If it boils, the gas (steam) takes up more room than the liquid did.

Answer 3

just as heat rises it also causes expansion in the medium they are in. a good example is in earths atmosphere. we have molecules of water interspersed with air molecules and heating by the sun during the day causes expansion of both molecules which makes them weigh less which causes them to rise and when they get high enough the water vapor cools and condenses and falls back to earth as rain, sleet, hail, or snow. it's all very simple.

Answer 4

One thing about water, it expands when it reaches 32F. Ice floats because its density is less as a solid than as a liquid.

Answer 5

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