The right-hand side of this equation is called the Poynting factor after the British physicist who derived it at the turn of the 20th century.

Example: What is the vapor pressure of water at 500 atm if the reference state is the normal boiling point?

This choice of reference state implies T = 373 K and psat,ref = 1 atm. The molar volume of water at this state (from steam table A.1) is vL = 1.88x10-5 m3/mole. With these values, and converting the pressure difference to 5x107 Pa, Eq (5.17) gives a Poynting factor of 1.35, or pSat = 1.35 atm.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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