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Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. ... In general a physical change is reversible using physical  change.

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a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change. Compare

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Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume. An object made from a comparatively dense material (such as iron) will have less volume than an object of equal mass made from some less dense substance (such as water).

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Melting is the process by which a substance changes from the solid phase to the liquid phase

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Freezing, or solidification, is a phase transition in which a liquid turns into a solid when its temperature is lowered below its freezing point. ... For example, agar displays a hysteresis in its melting point and freezing point.

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When anything solid turns into a gas without first becoming liquid, that'ssublimation. 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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Condensation is the change of the physical state of matter from gas phase into liquid phase, and is the reverse of evaporation. ... It can also be defined as the change in the state of water vapour to liquid water when in contact with a liquid or solid surface or cloud condensation nuclei within the atmosphere.

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Evaporation is the process of a substance in a liquid state changing to a gaseous state due to an increase in temperature and/or pressure.Evaporation is a fundamental part of the water cycle and is constantly occurring throughout nature.

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A solid is a sample of matter that retains its shape and density when not confined. ... Some solids, called crystalline solids, tend to fracture along defined surfaces that have a characteristic shape depending on the arrangement of, and the forces among, the atoms or molecules in the sample.

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A drink or beverage is a liquid intended for human consumption. ... Common types of drinks include plain water, milk, juices, coffee, tea, and soft drinks.

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Definition of gas. plural gases also gasses. 1 : a fluid (such as air) that has neither independent shape nor volume but tends to expand indefinitely. 2 a : a combustiblegas or gaseous mixture for fuel or lighting; especially : natural gas. b : a gaseous product of digestion; also : discomfort from this.

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A unit of matter; the smallest unit of a chemical element. Each atomconsists of a nucleus, which has a positive charge, and a set of electrons that move around the nucleus. (See Bohr atom.) Note: Atoms link together to form molecules.

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matter is the term for any type of material. Matter is anything that has mass and takes up space. At a minimum, matter requires at least one subatomic particle, although most matter consists of atoms