All substances are made from particles, and the forces between the particles are different in solids, liquids and gases. The arrangement, movement and spacing of the particles explain many of the ...

Students are introduced to the idea that matter is composed of atoms and molecules that are attracted to each other and in constant motion. Students explore the attractions and motion of atoms and ...

Forces hold the particles together which vary in size for solids, liquids and gases. This is called kinetic theory. You walk into a coffee shop and immediately smell coffee. Why? One reason is ...