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. The ...

Substances can exist in three states of matter - solid, liquid and gas. Substances can change states. To change the state of a substance energy must be transferred to, or from, the substance. Phew! On ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

Rae Robertson-Anderson receives funding from the US National Science Foundation, Air Force Office of Scientific Research, and National Institutes of Health. Imagine you’re eating dinner. You try to ...