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Water - Boiling Points at Vacuum Pressure

Online calculator, figures and tables giving the boiling temperatures of water in varying vacuum, SI and Imperial units.

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The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid, and the liquid changes into a vapor. The boiling point of a liquid varies depending upon the surrounding pressure.

A liquid in a partial vacuum has a lower boiling point than when that liquid is at atmospheric pressure.

Online Water Boiling Point Calculator

The calculator below can be used to calculate the water boiling point at given, absolute pressures.
The output temperature is given as °C, °F, K and °R.

Note! Pressure must be within the ranges 0-1000 mbara, 0-14.7 psia, 0-760 mm Hg or 0-30 in Hg.

Pressure

Choose the actual unit of pressure:

mbara psia mm Hg in Hg

Below, figures and tables show the boiling point of water at varying vacuum.

See Water and Heavy Water  for thermodynamic properties at standard condtions.
See also other properties of Water at varying temperature and pressure: Boiling points at high pressure, Density and specific weightDynamic and kinematic viscosity, Enthalpy and entropy, Heat of vaporization, Ionization Constant, pKw, of normal and heavy water, Melting points at high pressure, Prandtl numberProperties at Gas-Liquid Equilibrium Conditions, Saturation pressure, Specific gravity, Specific heat (heat capacity), Specific volume, Thermal conductivity, Thermal diffusivity and Vapour pressure at gas-liquid equilibrium.


Boiling point as function of the pressure, given as "mm Hg below  standard atmospheric pressure":
(= Vacuum of e.g. 100 mm Hg is the same as [760-100]=660 mm Hg absolute pressure)

Vacuum_BP_C


Vacuum_BP_C_log



Vacuum_BP_F

Vacuum_BP_F_log



The table shows the water boiling temperature at different vacuum pressure.
Vacuum is given as absolute pressure and pressure "below standard atmospheric pressure" (1 bara = 0 vacuum):

For full table with Vacuum and Water Boiling Point - rotate the screen!

Absolute pressure Vacuum (below standard atmospheric pressure) Water boiling point
[Microns]
[μm Hg]
[in Hg] [psia] [mbara]
[100*Pa]
[in Hg] [mmHg]
[Torr]
[mbar]
[100*Pa]
[°C] [°F]
760000 29.92 14.696 1013.3 0 0 0 100 212
635000 25.00 12.279 846.6 4.92 125.0 167 96 205
525526 20.69 10.162 700.6 9.23 234.4 313 90 194
500000 19.69 9.668 666.6 10.24 260.1 347 89 192
355092 13.98 6.866 473.4 15.94 404.9 540 80 176
233680 9.200 4.519 311.5 20.72 526.3 702 70 158
200000 7.874 3.867 266.6 22.05 560.1 747 67 152
149352 5.880 2.888 199.1 24.04 610.6 814 60 140
100000 3.937 1.934 133.3 25.98 659.9 880 52 125
92456 3.640 1.788 123.3 26.28 667.5 890 50 122
55118 2.170 1.066 73.48 27.75 704.9 940 40 104
31750 1.250 0.614 42.33 28.67 728.2 971 30 86
25400 1.000 0.491 33.86 28.92 734.6 979 27 80
22860 0.900 0.442 30.48 29.02 737.1 983 24 76
20320 0.800 0.393 27.09 29.12 739.6 986 22 72
17780 0.700 0.344 23.71 29.22 742.2 990 21 69
15240 0.600 0.295 20.32 29.32 744.7 993 18 64
12700 0.500 0.246 16.93 29.42 747.3 996 15 59
10160 0.400 0.196 13.55 29.52 749.8 1000 12 53
7620 0.300 0.147 10.16 29.62 752.3 1003 7 45
4572 0.180 0.088 6.10 29.74 755.4 1007 0 32
2540 0.100 0.049 3.39 29.82 757.4 1009.82 -6 21
1270 0.050 0.025 1.69 29.87 758.7 1011.51 -14 6
1000 0.039 0.019 1.33 29.88 759.0 1011.85 -17 1
500 0.020 0.0097 0.67 29.90 759.5 1012.53 -24 -12
300 0.012 0.0058 0.40 29.91 759.7 1012.87 -29 -21
254 0.010 0.0049 0.34 29.91 759.7 1012.87 -31 -24
127 0.005 0.0025 0.17 29.92 759.8 1013.04 -37 -35
100 0.0039 0.0019 0.13 29.92 760.0 1013.21 -40 -40
50 0.0020 0.0010 0.07 29.92 760.0 1013.21 -46 -50
25.4 0.0010 0.0005 0.03 29.919 759.9 1013.17 -51 -60
12.7 0.0005 0.00025 0.017 29.9195 760.0 1013.19 -57 -70
2.54 0.0001 0.00005 0.003 29.9199 760.0 1013.20 -68 -90

  • 0% vacuum = 760 torr = 14.7 psia = 29.92 in mercury abs = 101.4 kPa abs
  • 50% vacuum = 380 torr = 7.3 psia = 15 in mercury abs = 50.8 kPa abs
  • 99.9% vacuum = 1 torr = 0.01934 psia = 0.03937 in mercury abs = 1.3 kPa abs
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