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.
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