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Physical changes are changes affecting the form of a chemical substance, but not its chemical composition.

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A usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances.

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he degree of compactness of a substance.

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ake or become liquefied by heat.

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below 32°F (0°C).

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When anything solid turns into a gas without first becoming liquid, that's sublimation.

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Water that collects as droplets on a cold surface when humid air is in contact with it.

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The process of turning from liquid into vapor.

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A substance or object that is solid rather than liquid or fluid.

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A substance that flows freely but is of constant volume, having a consistency like that of water or oil.

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An airlike fluid substance which expands freely to fill any space available, irrespective of its quantity.

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The basic unit of a chemical element.

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Physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.