A transition heat is the most important
characteristics of first-order phase transitions. Black was first who
discovered in 1762 that in the transfer of water to vapor, some quantity of
heat is absorbed, which he termed the latent evaporation heat.
In spite of more than the two-hundred-year
period of the heat transfer concept existence there are no analytical
expressions relating the transition heat with other parameters of phase
transitions. For example, the fundamental "Physics Encyclopedia",
articles devoted to the transition heat, evaporation
heat, and so on, comprises no formulae but only tables of experimental
data.
One can also mention monographs which have no
relationships except for the conventional definition of the transition heat
λ=TΔS. Hence, obtaining the relationships between the transition heat and other
parameters of first-order phase transitions will be a substantial contribution
into the theory of first-order phase transitions.
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