The AccuPyc is widely used for analyzing both solids and powders. Little information is readily available for using a pycnometer to analyze liquids. The AccuPyc measures pressure of the system to determine volume and calculate density. Pressure generated by sample evaporation can diminish precision and system equilibrium might not be obtainable.
Vapor pressure is the equilibrium pressure on a liquid by its vapor within a closed system. The molecules of liquids are held together by physical bonds, that is Van der Waal forces. Liquids with weaker bonds create vapor more easily and have higher vapor pressure than liquids with stronger bonds and lower vapor pressure. An increase in temperature causes an increase in vapor pressure.
This document shows the results and conditions used to analyze various liquids with different vapor pressures on the AccuPyc and how selecting different parameters impact the analysis. Liquids that could not damage the instrument were used. Helium was used unless otherwise stated.
The AccuPyc is widely used for analyzing both solids and powders. Little information is readily available for using a pycnometer to analyze liquids. The AccuPyc measures pressure of the system to determine volume and calculate density. Pressure generated by sample evaporation can diminish precision and system equilibrium might not be obtainable.
Vapor pressure is the equilibrium pressure on a liquid by its vapor within a closed system. The molecules of liquids are held together by physical bonds, that is Van der Waal forces. Liquids with weaker bonds create vapor more easily and have higher vapor pressure than liquids with stronger bonds and lower vapor pressure. An increase in temperature causes an increase in vapor pressure.
This document shows the results and conditions used to analyze various liquids with different vapor pressures on the AccuPyc and how selecting different parameters impact the analysis. Liquids that could not damage the instrument were used. Helium was used unless otherwise stated.
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