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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 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.
See also Water Boiling points at high pressure, Density, specific weight and thermal expansion coefficient, Dynamic and kinematic viscosity, Enthalpy and entropy, Heat of vaporization, Ionization Constant, pKw, of normal and heavy water, Melting points at high pressure, Saturation pressure, Specific gravity, Specific heat (heat capacity) and Specific volume for online calculatores, figures and tables.

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):

Absolute pressure Vacuum (below standard atmospheric pressure) Water boiling point
[Microns]
[μm Hg]
[in Hg] [psia] [mbara]
[0.01*Pa]
[in Hg] [mmHg]
[Torr]
[mbar]
[0.01*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 16661 96 205
525526 20.69 10.162 700.6 9.23 234.4 31256 90 194
500000 19.69 9.668 666.6 10.24 260.1 34677 89 192
355092 13.98 6.866 473.4 15.94 404.9 53979 80 176
233680 9.200 4.519 311.5 20.72 526.3 70166 70 158
200000 7.874 3.867 266.6 22.05 560.1 74670 67 152
149352 5.880 2.888 199.1 24.04 610.6 81409 60 140
100000 3.937 1.934 133.3 25.98 659.9 87978 52 125
92456 3.640 1.788 123.3 26.28 667.5 88994 50 122
55118 2.170 1.066 73.48 27.75 704.9 93972 40 104
31750 1.250 0.614 42.33 28.67 728.2 97088 30 86
25400 1.000 0.491 33.86 28.92 734.6 97934 27 80
22860 0.900 0.442 30.48 29.02 737.1 98273 24 76
20320 0.800 0.393 27.09 29.12 739.6 98612 22 72
17780 0.700 0.344 23.71 29.22 742.2 98950 21 69
15240 0.600 0.295 20.32 29.32 744.7 99289 18 64
12700 0.500 0.246 16.93 29.42 747.3 99628 15 59
10160 0.400 0.196 13.55 29.52 749.8 99966 12 53
7620 0.300 0.147 10.16 29.62 752.3 100305 7 45
4572 0.180 0.088 6.10 29.74 755.4 100711 0 32
2540 0.100 0.049 3.39 29.82 757.4 100982 -6 21
1270 0.050 0.025 1.69 29.87 758.7 101151 -14 6
1000 0.039 0.019 1.33 29.88 759.0 101185 -17 1
500 0.020 0.0097 0.67 29.90 759.5 101253 -24 -12
300 0.012 0.0058 0.40 29.91 759.7 101287 -29 -21
254 0.010 0.0049 0.34 29.91 759.7 101287 -31 -24
127 0.005 0.0025 0.17 29.92 759.8 101304 -37 -35
100 0.0039 0.0019 0.13 29.92 760.0 101321 -40 -40
50 0.0020 0.0010 0.07 29.92 760.0 101321 -46 -50
25.4 0.0010 0.0005 0.03 29.919 759.9 101317 -51 -60
12.7 0.0005 0.00025 0.017 29.9195 760.0 101319 -57 -70
2.54 0.0001 0.00005 0.003 29.9199 760.0 101320 -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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