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AGGREGATION (from the Lat. ad, to, gregare, to collect together), in physics, a collective term for the forms or states in which matter exists. Three primary "states of aggregation" are recognized-gaseous, liquid and solid. Generally, if a solid be heated to a certain temperature, it melts or fuses, assuming the liquid condition (see FUSION); if the heating be continued the liquid boils and becomes a vapour (see VAPORIZATION.) On the other hand, if a gas be sufficiently cooled and compressed, it liquefies; this transition is treated theoretically in the article CONDENSATION OF GASES, and experimentally in the article LIQUID GASES.

Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)

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