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PS Ch 16
Sections 1, 2, and 3
| Term | Definition |
|---|---|
| kinetic theory | Explanation of the behavior of molecules in matter; states that all matter is made of constantly moving particles that collide without losing energy. |
| melting point | Temperature at which a solid begins to liquefy. |
| heat of fusion | Amount of energy required to change a substance from the solid phase to the liquid phase. |
| boiling point | The temperature at which the pressure of the vapor in the liquid is equal to the external pressure acting on the surface of the liquid. |
| heat of vaporization | The amount of energy required for the liquid at its boiling point to become gas. |
| diffusion | Spreading of particles throughout a given volume until they are uniformly distributed. |
| plasma | Matter consisting of positively and negatively charged particles. |
| thermal expansion | Increase in the size of a substance when the temperature is increased. |
| pascal | SI unit of pressure. |