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Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.

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Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

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The degree of compactness of a substance.

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Make 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. When the surface layer of snow or ice turns into fog or steam without melting, this is an example of sublimation. The verb sublimation is from the Latin word sublimare,meaning “raised to a higher status.”

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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.