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Solid
State of matter in which volume and shape of a substance are fixed (67)
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Liquid
State of matter that has a definite volume, but not a definite shape (68)
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Gas
State of matter that does not have a definite volume or shape (69)
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Evaporation
Change of a substance from a liquid to a gas (76)
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Condensation
Change of state from a gas to a liquid (77)
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Melting point
Temperature at which a substance changes from a solid to a liquid; physical property; different substances have different melting points (75)
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Boiling
Temperature at which a liquid boils (76)
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Sublimation
The process in which a solid changes directly into a gas; endothermic change because energy is gained by the substance as it changes state (78)
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Melting
Change of state from a solid to a liquid (75)
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Freezing
Change of state from a liquid to a solid (75)
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Mass
Measure of the amount of matter in an object (25, 41, 138)
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Matter
Anything that has mass and takes up space (38)
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Mixture
Combination of two or more substances that are not chemically combined (98)
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Physical change
Change of matter from one form to another without a change in chemical properties (48)
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Absolute zero
Temperature at which molecular energy is at a minimum; 0 K; -273.16°C (277)
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Boiling point
Temperature at which a liquid boils (76)
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Density
Ratio of the mass of a substance to the volume of the substance (26, 45)
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Plasma
State of matter in which electrons have been removed from atoms; made up of ions and electrons
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Vaporization
The process of becoming a vapor; Conversion of a solid or liquid into a gas; Three types of vaporization are sublimation, evaporation, and boiling
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