Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Critical Temperatures and Pressures for some Common Substances

Critical temperatures and pressures for some common substances - air, alcohol, ether, oxygen and more

Sponsored Links

Gases can be converted to liquids by compressing the gas at a suitable temperature. However, they become more difficult to liquefy as the temperature increases because the kinetic energies of the particles that make up the gas also increase. At the critical temperature they cannot longer be liquified.

  • Critical Temperature: The temperature which above, a substance can not exist as a liquid, no matter how much pressure is applied. Every substance has a critical temperature.
  • Critical Pressure: The pressure required to liquify a substance vapor at its critical temperature
  • Critical point: The end point of the pressure-temperature curve that designates conditions under which a liquid and its vapor can coexist. At higher temperatures, the gas cannot be liquefied by pressure alone. At the critical point, defined by the critical temperature Tc and the critical pressure pc, phase boundaries vanish.
  • Triple point:  The temperature and pressure at which the three phases (gas, liquid, and solid) of a substance coexist in thermodynamic equilibrium.

The table below shows critical temperature and pressure for some common substances, together with boiling temperature.


See Triple point for listing of triple point values for common substances.

SubstanceCritical temperatureCritical pressureBoiling temperature (1 atm)
[°F][°C][psi], [lb/in2]

Load Calculator!
[bar][°F][°C]
Air -220.94 -140.52 549.08 37.858 - -
Ammonia (NH3) 270 132.4 1636 112.8 -27.4 -33
Argon -188 -122 705.6 48.7 -302.5 -.85.8
Butane 305.6 152 550.4 38 32 0
Carbon-dioxide (CO2) 87.8 31.2 1071.6 73.8 -110 -79
Carbon-monoxide (CO) -220.5 -140.3 507.5 35 -310 -190
Chlorine 291 144 1118.7 77.1 -29.3 -34
Decane 653 345 301.7 20.8 345 174
Dowtherm A 465 32.1
Ethane 90.0 32.2 708 48.9 -127.4 -88.5
Ethanol (alcohol) 467 242 914 63 173 78.4
Ethylether 381 194 522 36 94.2 34.6
Ethylene 48.9 9.4 735 50.7 -272.6 -169.2
Fluorine -200 -129 808.5 55.8 -307 -188
Helium -456 -271 33.2 2.3 -452 -269
Hydrogen (H) -400 -240 188.2 13.0 -423 -253
Hydrogen Chloride 125 51.6 1198 82.7 -121.1 -85.1
Isobutane 274 135 529.2 36.5 10.9 -11.7
Isobutylene 293 145 580 40.0 19.6 -6.9
Isononane 590 310 335.1 23.1 303 151
Methane -117 -82.6 673.3 46.5 -259 -162
Nitrogen (N) -232.6 -147 492.4 34.0 -321 -195
Nitrous Oxide (N2O) 97.4 36.4 1047.6 72.3 -127 -88.5
Oxygen (O2) -181.5 -118.6 732 50.5 -297 -183
Phosgene 823.2 56.8 46.9 8.3
Propane 206.1 96.7 617.4 42.6 -44 -42
Propylbenzene 689 365 464.2 32 319 159
Propylene 198 92.4 670.3 46.3 -54 -48
Refrigerants
Undecane 691 366 287.2 19.8 385 196
Water 705 374 3206.2 220.5 212 100
Sponsored Links

Related Topics

Related Documents

Sponsored Links

Share

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Topics

Unit Converters

Temperature

oC
oF


Load Calculator!

Length

m
km
in
ft
yards
miles
naut miles


Load Calculator!

Area

m2
km2
in2
ft2
miles2
acres


Load Calculator!

Volume

m3
liters
in3
ft3
us gal


Load Calculator!

Weight

kgf
N
lbf


Load Calculator!

Velocity

m/s
km/h
ft/min
ft/s
mph
knots


Load Calculator!

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


Load Calculator!

Flow

m3/s
m3/h
US gpm
cfm


Load Calculator!

10 21

This website use cookies. By continuing to browse you are agreeing to our use of cookies! Learn more