14 terms

Phases of Matter - Quiz 1 Words

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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.
Buoyancy
ability of a fluid to exert an upward force on an object immersed in the fluid.
Condensation
temperature at which a gas becomes a liquid
Diffusion
spreading of particles throughout a given volume until they are uniformly distributed.
Evaporation
vaporization that occurs on the surface of a liquid and can occur at temperatures below the liquid's boiling point.
Heat of Fusion
amount of energy required to change a substance from the solid phase to the liquid phase.
Heat of Vaporization
amount of energy required for liquid particles to escape the attractive forces within the liquid or the energy required to change from a liquid to a gas.
Kinetic Theory
explanation of behavior of molecules of 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.
Plasma
high temperature gas with an overall neutral charge that is the most common state of matter in the universe.
Sublimation
temperature and pressure at which a solid becomes a gas
Temperature
a measure of the average kinetic energy of all the particles in an object.
Thermal Expansion
increase in size of a substance that results from the separation of its molecules when the temperature is increased.
Viscosity
a fluid's resistance to flow.
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