Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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center of gravity that point in or near a body or mass about which all of its parts are in perfect balance.
specific gravity the ratio of the weight or mass of a given substance to that of a standard, which for solids and liquids is water and for gases is hydrogen or air.
zero gravity the condition of apparent weightlessness, as of a body in orbit, when the apparent effect of gravity is zero.