FIXITY

, or Fixedness, the quality of a body which determines it fixed; or a property which enables it to endure the fire and other violent agents.

A body may be said to be fixed in two respects: 1st, When on being exposed to the fire, or a corrosive menstruum, its particles are indeed separated, and the body rendered fluid, but without being resolved into its first elements. The 2d, when the body sustains the active force of the fire or menstruums whilst its integral parts are not carried off in fumes. Each kind of Fixity is the result of a strong or intimate cohesion between the particles.

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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.

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