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Condensation The process by which a gas changes into a liquid due to cooling Evaporation The process by which a liquid changes into a gas due to the addition of heat Matter Anything that has mass and takes up space Properties A quality or trait belonging to an individual or thing; can be used to identify substances Variety/Various A number of things that differ from one another Gas A state of matter in which the molecules are very spread apart; has neither a definite shape or volume Liquid A state of matter in which the molecules are somewhat close together; has a definite volume but no definite shape Molecule The smallest particle of a substance that retains all the properties of the substance Solid A state of matter in which the molecules are tightly packed together in an organized manner; has a definite shape and volume