Directions
Hungry? Let’s take a potato and pop it in the oven—and see what happens when a cold potato turns into a hot potato.
The difference between hot and cold is all about the movement of molecules. When you heat a substance—a solid, a liquid, or a gas—what you’re really doing is adding energy to its molecules.
Simply put, heat measures the movement of molecules. The hotter the substance, the faster its molecules are moving.