Answer
For a noncrystalline ceramic, the glass transition temperature is the temperature at which there is a change of slope for the specific volume versus temperature curve.
For a crystalline material, the melting temperature is the temperature at which there is a sudden and discontinuous decrease in the specific-volume-versus-temperature curve.
Work Step by Step
For a noncrystalline ceramic, the glass transition temperature is the temperature at which there is a change of slope for the specific volume versus temperature curve.
For a crystalline material, the melting temperature is the temperature at which there is a sudden and discontinuous decrease in the specific-volume-versus-temperature curve.