Values at 25 o C (77 o F, 298 K) and atmospheric pressure
|Specific Gravity , air = 1||0.070|
|Specific Volume ( ft 3 /lb, m 3 /kg )||194, 12.1|
|Density of liquid at atmospheric pressure ( lb/ft 3 , kg/m 3 )||4.43, 71.0|
|Absolute Viscosity ( lb m /ft s, centipoises )||6.05 10 -6 , 0.009|
|Sound velocity in gas ( m/s )||1315|
|Specific Heat - c p - ( Btu/lb o F or cal/g o C, J/kgK )||3.42, 14310|
|Specific Heat Ratio - c p /c v||1.405|
|Gas constant - R - ( ft lb/lb o R, J/kg o C )||767, 4126|
|Thermal Conductivity ( Btu/hr ft o F, W/m o C )||0.105, 0.182|
|Boiling Point - saturation pressure 14.7 psia and 760 mm Hg - ( o F, o K )||-423, 20.4|
|Latent Heat of Evaporation at boiling point ( Btu/lb, J/kg )||192, 447000|
|Freezing or Melting Point at 1 atm ( o F, o C )||-434.6, -259.1|
|Latent Heat of Fusion ( Btu/lb, J/kg )||25.0, 58000|
|Critical Temperature ( o F, o C )||-399.8, -240.0|
|Critical Pressure ( psia, MN/m 2 )||189, 1.30|
|Critical Volume ( ft 3 /lb, m 3 /kg )||0.53, 0.033|
|Heat of combustion ( Btu/ft 3 , Btu/lb, kJ/kg )||320, 62050, 144000|
Follow the links below to get values for the listed properties of hydrogen at varying pressure and temperature :
See also more about atmospheric pressure , and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure ,
as well as Thermophysical properties of: Acetone , Acetylene , Air , Ammonia , Argon , Benzene , Butane , Carbon dioxide , Carbon monoxide , Ethane , Ethanol , Ethylene , Helium , Hydrogen sulfide , Methane , Methanol , Nitrogen , Oxygen , Pentane , Propane , Toluene , Water and Heavy water, D 2 O .
Hydrogen is a gas at standard conditions. However, at very low temperature and/or high pressures the gas becomes a liquid or a solid.
The hydrogen phase diagram shows the phase behavior with changes in temperature and pressure. The curve between the critical point and the triple point shows the hydrogen boiling point with changes in pressure. It also shows the saturation pressure with changes in temperature.
At the critical point there is no change of state when pressure is increased or if heat is added.
The triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium.
Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.
Chemical, physical and thermal properties of acetone, also called 2-propanone, dimethyl ketone and pyroacetic acid. Phase diagram included.
Chemical, physical and thermal properties of benzene, also called benzol. Phase diagram included.
Heat of combustion (energy content) for som common substances - with examples how to calculate heat of combustion.
Critical temperatures and pressures for some common substances like air, alcohol, ether, oxygen and more.
Cryogenic properties as density, boiling points and heat of evaporation for fluids like hydrogen, methane, oxygen, nitrogen, fluorine and helium.
Chemical, Physical and Thermal Properties of Ethane - C2H6.
Chemical, physical and thermal properties of ethylene, also called ethene, acetene and olefiant gas. Phase diagram included.
Combustion heat values for gases like acetylene, blast furnace gas, ethane, biogas and more - Gross and Net values.
Autoignition points for fuels and chemicals like butane, coke, hydrogen, petroleum and more.
Densities and molecular weights of common gases like acetylene, air, methane, nitrogen, oxygen and others.
Absolute (dynamic) viscosities of some common gases.
Flame and explosion limits for gases like propane, methane, butane, acetylene and more.
Ratios of specific heat for gases with constant pressure and volume processes.
Specific gravities of air, ammonia, butadiene, carbon dioxide, carbon monoxide and some other common gases.
Speed of sound in some gases at zero degrees Celsius and atmospheric pressure.
Chemical, Physical and Thermal Properties of Helium - He.
Online calculator, figures and tables showing density and specific weight of hydrogen, H2, at temperatures ranging from -260 to 325 °C (-435 to 620 °F) at atmospheric and higher pressure - Imperial and SI Units.
Specific heat of Hydrogen Gas - H2 - at temperatures ranging 175 - 6000 K.
Online calculator, figures and table showing thermal conductivity of hydrogen, H2, at varying temperature and pressure - Imperial and SI Units.
Definition and molecular weight (molar mass) of some common substances.
Chemical, physical and thermal properties of pentane, also called n-pentane. Phase diagram included.
Solubility of Ammonia, Argon, Carbon Dioxide, Carbon Monoxide, Chlorine, Ethane, Ethylene, Helium, Hydrogen, Hydrogen Sulfide, Methane, Nitrogen, Oxygen and Sulfur Dioxide in water.
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!
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.