pinna kolmemõõtmeline esitus, mis kirjeldab aine erimahu varieerumist sõltuvalt rõhu ja temperatuuri muutusest
a three-dimensional graphical representation of a surface, describing the variation of the specific volume of a substance, with in dependent change of pressure and temperature
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External change of volume (or specific volume) of materia lwith temperature and pressure during transition between molten state and solidified state of plastic, showing correlation between three values.
