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2. PvT measuring devices
In the literature, numerous devices have been described for measuring dimensional changes in a material as a function of temperature and other variables. Two methods are widely used to determine changes in volume as a function of temperature and pressure: the piston-cylinder technique and the piezometer technique
2.1 Piston-cylinder technology
In this technique, the material is confined within a rigid cylinder or die, which it fills completely. Pressure is applied by a load-bearing piston, and the piston's displacement, recorded as a function of temperature and pressure variations, is used to calculate the sample's specific volume.
The main drawback of this direct...
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PvT measuring devices
Data interpretation
Bibliography
Standards
- Plastics – Determination of specific volume as a function of temperature and pressure (PvT diagram) – Method using a piston device. - ISO 17744:2004 - 11-04
The standard specifies the use of a piston apparatus, in which the sample under study, placed in a measuring cell, is pressurized by means of a piston. Measurements can be carried out under constant pressure or constant temperature conditions. In constant pressure...
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