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solid a state of matter that has a definite shape and a definite volume crystalline solid a solid that is made up of crystals in which particles are arranged in regular, repeating pattern amorphous solid a solid made up of particles that are not arranged in a regular pattern liquid a state of matter that has no definite shape but has a definite volume fluid any substance that can flow surface tension the result of an inward pull among that molecules of a liquid that brings the molecules on the surface closer together; causes the surface to act as if it has a thin skin viscosity a liquid's resistance to flowing gas a state of matter with no definite shape or volume melting the change in state from solid to liquid melting point the temperature at which a substance changed from a solid to a liquid freezing the change in state from a liquid to a solid vaporization the change of state from a liquid to a gas evaporation the process that occurs when vaporization takes place only on the surface of a liquid boiling the process that occurs when vaporization takes place inside a liquid as well as on the surface boiling point the temperature at which a substance changes from a liquid to a gas condensation the change of state from a gas to a liquid sublimation the change in state from a solid directly to a gas without passing through the liquid state pressure the force pushing on a surface divided by the area of that surface Boyle's Law a principle that describes the relationship between the pressure and volume of a gas at constant temperature Charle's Law a principle that describes the relationship between the temperature and volume of a gas at constant pressure