# Rational Psychrometric Formulae/Appendix No. 1

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APPENDIX No. 1

PROOF OF FORMULA [1]

71In this formula is the pressure of saturated vapor corresponding to the dew point , and is the vapor pressure at saturation corresponding to temperature . It also follows that

At constant pressure

[30], or

Also if it is assumed is constant, i.e., is constant for saturated water vapor (not exactly correct),

Therefore

[31]

But substituting for its value in [30]