Students are introduced to the idea that matter is composed of atoms and molecules that are ... molecules as they experiment with and observe the heating and cooling of a solid, liquid, and gas.

Researchers have recently identified 'dark electrons'—electrons undetectable using traditional spectroscopy—within solid materials. By examining palladium diselenide, the team ...

Substances can exist in three states of matter - solid, liquid and gas. All substances are made from particles, and the forces between the particles are different in solids, liquids and gases.