why does matter compress when it’s cold, but when you compress it, it generates heat like in the core of the sun.

Question

why does matter compress when it’s cold, but when you compress it, it generates heat like in the core of the sun.

In: Chemistry

Answer 1

Molecules jiggle around. This jiggling is what we call heat.

When the object is cooled, the molecules jiggle less, so the molecules can be closer to each other with out colliding.

If we compress the matter, there’s the same number of jiggling molecules but in a smaller space. So the density of jiggles per unit of volume increases and this is heat.

[See 2mn10secs of this video](https://youtu.be/7J52mDjZzto)