What makes soup hot and ice cold?

Here's why:

* Temperature is a measure of how much heat energy something has.

* Heat energy causes molecules to move faster.

* The faster molecules move, the hotter something is.

Soup:

* When you heat soup, you're adding heat energy to it.

* The heat energy causes the water molecules in the soup to move faster.

* The faster the molecules move, the hotter the soup becomes.

Ice:

* Ice is cold because it has less heat energy than soup.

* The water molecules in ice move slowly because they don't have much energy.

* The slower the molecules move, the colder the ice becomes.

In short:

* Hot soup has a lot of heat energy, making its molecules move fast.

* Cold ice has little heat energy, making its molecules move slowly.