Water Boiling Point and Saturation Pressure Calculator
Find the boiling (saturation) temperature of water at a given pressure, or the saturation pressure at a given temperature, from the IAPWS IF97 industrial formulation used in steam tables.
- Absolute pressure = 11.013 bar a
- IAPWS IF97 region 4 saturation temperature equation: Ts = 184.12 °C
IAPWS IF97 Saturation Line
β = p¼, ϑ = T + n₉ ÷ (T − n₁₀)
IAPWS IF97 is the international industrial standard for water and steam properties used in steam tables and boiler calculations. It is valid on the saturation line from the triple point (0.01 °C, 611.2 Pa) to the critical point (373.946 °C, 220.64 bar). Pressures in the equations are absolute.
Worked example
Steam at 10 barg (11.013 bar a) saturates at 184.1 °C. Water at 100 °C boils at 1.0142 bar a, and at 0.2 bar a (deep vacuum) it boils at only 60.1 °C.
Frequently Asked Questions
Why does water boil at a lower temperature at altitude?
Atmospheric pressure is lower, and the saturation temperature falls with pressure. At about 2000 m, water boils near 93 °C.
Is this the same as steam tables?
Yes. Modern steam tables are calculated from IAPWS IF97, and this calculator uses the same saturation equations.
Does it work for vacuum?
Yes, down to 611 Pa absolute. Enter absolute units such as mbar a or kPa a.
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