Saturation vapor pressure of pure water computed with the Buck (1981) equation over liquid and the Magnus-Tetens formula over ice. Used in HVAC design, boiler sizing, distillation, and psychrometrics.
Saturation vapor pressure p° (absolute)
—Pa
— mbar— kPa— bar— atm
Pascal (abs.)
—
Pa
Millibar (abs.)
—
mbar
Bar (abs.)
—
bar
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T [°C]
Pa
mbar
kPa
bar
atm
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p°(H₂O) liquid
p°(H₂O) ice
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