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 ...

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 ...

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At first, the photons settle into a state with zero momentum, but as this state 'fills up', pairs of photons begin to spill ...