5. Standard conditions. Standard conditions
We have shown that a two-phase pure body has a variance equal to 1. This means that the equilibrium temperature between phases can only be defined unambiguously if we fix the value of the pressure.
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The temperature scale was constructed from measurements of two-phase water equilibria defined under a particular pressure, normal atmospheric pressure p 0 .
Normal pressure is equal to p 0 = 101,325 Pa (= 1 atmosphere).
Thus, t = 0 °C corresponds to the liquid-solid equilibrium of pure water under pressure p 0 and t = 100 °C is the temperature for which the saturating vapor pressure of pure liquid water is p ...
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Standard conditions. Standard conditions
Data on normal melting and boiling of organic compounds
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