| A | B |
|---|
| 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 a 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 temperature is increased |
| buoyancy | ability of a fluid-a liquid or a gas - to exert an upward force on an object immersed in the fluid |
| pressure | amount of force exerted per unit area; SI unit is the pascal |
| viscosity | a fluid's resistance to flow |
| pascal | SI unit of pressure |
