![]() ![]() ![]() Critical Temperatures and Pressures for some Common Substances Critical temperatures and pressures for some common substances like air, alcohol, ether, oxygen and more.Combustion Heat Heat of combustion (energy content) for som common substances - with examples how to calculate heat of combustion.Benzene - Thermophysical properties Chemical, physical and thermal properties of benzene, also called benzol.Acetone - Thermophysical Properties Chemical, physical and thermal properties of acetone, also called 2-propanone, dimethyl ketone and pyroacetic acid.Material Properties Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.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. It also shows the saturation pressure with changes in temperature.Īt the critical point there is no change of state when pressure is increased or if heat is added. ![]() The curve between the critical point and the triple point shows the hydrogen boiling point with changes in pressure. The hydrogen phase diagram shows the phase behavior with changes in temperature and pressure. However, at very low temperature and/or high pressures the gas becomes a liquid or a solid. Hydrogen is a gas at standard conditions. See also more about atmospheric pressure, and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure,Īs 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 2O. Heat of combustion ( Btu/ft 3, Btu/lb, kJ/kg)įollow the links below to get values for the listed properties of hydrogen at varying pressure and temperature: Latent Heat of Evaporation at boiling point ( Btu/lb, J/kg)įreezing or Melting Point at 1 atm ( oF, oC) Thermal Conductivity ( Btu/hr ft oF, W/m oC)īoiling Point - saturation pressure 14.7 psia and 760 mm Hg - ( oF, oK) Gas constant - R - ( ft lb/lb oR, J/kg oC) Specific Heat - c p - ( Btu/lb oF or cal/g oC, J/kgK) Density of liquid at atmospheric pressure ( lb/ft 3, kg/m 3)Ībsolute Viscosity ( lb m/ft s, centipoises) ![]()
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