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Temperature

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A measure of how hot or cold a substance is; a measure of the average kinetic energy of the particles in a substance

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Liquid

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Has a fixed volume but not a fixed shape. Has particles that move freely past one another

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Gas

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Does not have a fixed volume or fixed shape. Will expand freely to fill the whole of a container

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Melting

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The process of a solid changing into a liquid due to an increase in temperature

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Boiling

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The process of a liquid changing into a gas due to an increase in temperature

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Freezing

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The process of a liquid changing into a solid due to a decrease in temperature

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Condensation

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The process of a gas turning into a liquid due to a decrease in temperature

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Precipitation

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Water that falls to the Earth as rain, snow, sleet, or hail

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Radiation

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The transfer of heat energy through air or empty space through electromagnetic waves

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Convection

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The circular transfer of heat energy that occurs when hot gas/liquid rises and cold gas/liquid sinks