Solid: firm and stable in shape; not liquid or fluid

Crystalline solid: defined edges and faces; sharp melting point

Amorphous solid: curved or irregular; wide-ranged melting point

Liquid: a substance that flows freely but is consistent with volume

Fluid: substance with no fixed shape, yields to extreme pressure; gas/liquid

Surface tension: tension between. liquid cause by attraction

Viscosity: thick, sticky, semi fluid in consistency from internal friction

Gas: a gaseous substance that cannot be liquified by pressure alone

Pressure: the force exerted per unit area

Melting: becoming liquified by heat

Melting point: the temperature at which a given solid melts

Freezing: below 32° Fahrenheit (0° Celsius); very cold; liquid turning to solid

Vaporization: solid/liquid turning to gas

Evaporation: transitions from liquid to gas from temperature

Boiling point: temperature at which liquid changes to vapor

Condensation: process of vapor turning to liquid

Sublimation: transition where a solid turns to gas.

Charles law: experimental gas law about gases expanding when heated

Directly proportional: if one goes up, the other goes up equally; when one goes down, the other goes down equally

Boyles law: reaction concerning compression and expansion of gas at a constant temperature

Inversely proportional: when one increases, the other decreases equally at which the other increased; when one decreases the other increases equally at which the other decreased