The triple point is the pressure-temperature combination at which the solid-vapor and liquid-vapor lines intersect. For water in Fig. 5.4, the total pressure over the two condensed phases at this point is their common vapor pressure (0.00611 atm). However, if the total pressure on a liquid/solid phase mixture is increased, the triple point migrates from its low-pressure value. To quantify this effect, the functions psat,S(p,T) and psat,L(p,T), are used in the following differential forms:
The temperature effect is given by the Clausius-Clapyron equation, Eq (5.6):
d psat,S | psat,SAhsub dt i rt2
Taking the derivative of Eq (5.17) with respect to p (at constant T) gives:
d psat 1 _ vcpsat,ref
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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.