Once again, the particles in a gas hit the walls of the container more often, causing the pressure to rise. Most substances can exist as a solid, liquid or gas. They can change state, usually when ...

Heating a substance makes its atoms and molecules move faster. This happens whether the substance is a solid, a liquid, or a gas. It’s not easy to see it happen in a solid but let’s try it for a ...

Everything that has mass is matter. In normal everyday life we come across matter in three states, solid, liquid and gas. They have a fixed shape and cannot flow The particles cannot move from ...

Students explore the attractions and motion of atoms and molecules as they experiment with and observe the heating and cooling of a solid, liquid, and gas.