Water Vapor Pressure — H₂O Saturation

Saturation pressure vs. temperature · Absolute · HVAC · Boilers · Process engineering

IAPWS-IF97 (liquid) IAPWS Sublimation (ice) −60…370 °C Pa · mbar · bar · kPa · atm · psi °C · °F · K

Temperature input

Temperature T 25 °C

−600100200300370°C

°C

— °F · — K

Equation used

About this tool

Saturation vapor pressure of pure water computed with the IAPWS-IF97 equation over liquid (0…373.9 °C) and the IAPWS sublimation formula over ice (down to −60 °C and beyond). Used in HVAC design, boiler sizing, distillation, and psychrometrics. Results available in Pa, mbar, kPa, bar, atm and psi; temperature in °C, °F or K.

Saturation vapor pressure p° (absolute)

—Pa

— mbar — kPa — bar — atm — psi

Pascal (abs.)

—

Millibar (abs.)

—

mbar

Bar (abs.)

—

bar

PSI (abs.)

—

psi

Reference table

T [°C]	T [°F]	Pa	mbar	kPa	bar	atm	psi

p° vs. T — full range chart

p°(H₂O) liquid

p°(H₂O) ice

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Full range chart in PRO

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