Steam tables (IAPWS-IF97)
Saturated and superheated steam and compressed water: enthalpy, entropy, specific volume, density, heat capacity and viscosity — by pressure, by temperature, or both.
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How this calculator works
Properties of water and steam from IAPWS-IF97, the industrial formulation used for steam tables worldwide: region 1 (compressed liquid), region 2 (steam) and region 4 (saturation line), plus viscosity from the IAPWS 2008 formulation. The code reproduces every value in the IAPWS verification tables for these regions (31 of 31), and matches an independent IF97 implementation to better than 0.0001 % across 48 test states.
Example — saturation at 10 bar a: saturation temperature 179.89 °C; hf = 762.7 kJ/kg, hg = 2777.1 kJ/kg, so the latent heat hfg = 2014.4 kJ/kg; the vapour specific volume is 0.1943 m³/kg. Superheated steam at 10 bar a and 250 °C (70 °C of superheat): h = 2943.2 kJ/kg, s = 6.927 kJ/kg·K, v = 0.2327 m³/kg.
Range: 0–800 °C up to 1,000 bar, except the near-critical region (IAPWS-IF97 region 3: above 350 °C and above about 165 bar); saturation up to 350 °C. Pressures are absolute — add the local atmospheric pressure to a gauge reading. References: IAPWS R7-97(2012), Revised Release on the IAPWS Industrial Formulation 1997; IAPWS R12-08, viscosity of ordinary water substance.