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glass transition temperature (Tg) definition

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1 : the approximate midpoint of a temperature range over which glass transition takes place. [ASTM D883-90] Also see coefficient of thermal expansion. 2 : the temperature at which an amorphous polymer changes from the glassy state to the rubbery state.

See also:

geisser tubes definition
glyconic acids definition
geminate recombination definition
halochromism definition
geodesic definition