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

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Chemical changes occur when a substance combines with another to form a new substance, calledchemical synthesis or, alternatively, chemicaldecomposition into two or more different substances.

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The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume.

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make or become more tender or loving.

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the freezing point of water.

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In psychology, sublimation is a mature type of defense mechanism where socially unacceptable impulses or idealizations are unconsciously transformed into socially acceptable actions or behavior, possibly resulting in a long-term conversion of the initial impulse.

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Condensation is the change of the physical state of matter from gas phase into liquid phase, and is the reverse of evaporation.

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Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance.

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Solid is one of the four fundamental states of matter It is characterized by structural rigidity and resistance to changes of shape or volume.

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A liquid is made up of tiny vibrating particles of matter, such as atoms, held together by intermolecular bonds.

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

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Electrons and a compact nucleus of protons and neutrons. An atom is the smallest constituent unit of ordinary matter that has the properties 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.