precipitation

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precipitation In meteorology, all forms of water particles, whether liquid or solid, that fall from the atmosphere to the ground. Distinguished from cloud, fog, dew, and frost, precipitation includes rain, drizzle, snow and hail. Measured by rain and snow gauges, the amount of precipitation is expressed in millimetres or inches of liquid water depth. In chemistry, the formation of an insoluble solid in a liquid by a reaction in the liquid between two or more soluble substances. This is the opposite of dissolving. Precipitation is used to create insoluble salts; precipitation reactions are employed to recognize certain ions.

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