Discussion
A liquid has a molar volume of 0.00010 cubic metres per mole. Estimate the Poynting exponent at 300 kelvin for a pressure difference of 10 bar, taking the gas constant as 8.314 joules per mole kelvin.
Answer: C
The exponent is the volume times the pressure difference divided by the gas constant and temperature, which is one ten-thousandth times one million pascals over about twenty-five hundred. That gives about four hundredths, so the factor itself is close to unity.
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