Triple point of water

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:

and dps;

dps;

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

Getting Started With Solar

Getting Started With Solar

Do we really want the one thing that gives us its resources unconditionally to suffer even more than it is suffering now? Nature, is a part of our being from the earliest human days. We respect Nature and it gives us its bounty, but in the recent past greedy money hungry corporations have made us all so destructive, so wasteful.

Get My Free Ebook


Post a comment