Phase Transitions. The above picture shows a block of solid Ar melting and subliming after exposur to aire at roughly room temperature. . http://en.wikipedia.org/wiki/Phase\_transition . Phase Diagram of H 2 O. http://people.virginia.edu/~lz2n/mse209/Chapter9-p1.pdf.
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The above picture shows a block of solid Ar melting and subliming after exposur to aire at roughly room temperature.
See also: http://www1.lsbu.ac.uk/water/phase.html
“The Theory of Thermodynamics”
NOTE: at a given overall composition (say: X), both the relative amounts of the two phases (a,b or c,d) AND the composition of one (or possibly both) depend on the temperature