Online calculator, figures and table showing thermal conductivity of hydrogen, H2, at varying temperature and pressure - Imperial and SI Units.
Thermal conductivity is a material property that describes ability to conduct heat. Thermal conductivity can be defined as
"the quantity of heat transmitted through a unit thickness of a material - in a direction normal to a surface of unit area - due to a unit temperature gradient under steady state conditions"
The SI unit used for thermal conductivity is [W/m K], while a common Imperial unit is [Btu/h ft °F].
The thermal conductivity of hydrogen depends on temperature and pressure as shown in the figures and table below.
There exist two isomers of hydrogen in equilibrium with each other; ortho and para hydrogen. At standard temperature and pressure, hydrogen gas contains about 25% of the para form and 75% of the ortho form, also known as the "normal form". At lower temperature the fraction of para hydrogen increases, and at very low temperature almost exclusively the para form is present. At increasing temperature the ortho fraction increases.
Online Hydrogen Thermal Conductivity Calculator
The calculator below can be used to estimate the thermal conductivity of hydrogen at given temperature and atmospheric pressure.
Estimates are based on numbers for "normal" hydrogen for T < 127°C/260°F, and numbers for para hydrogen for higher temperatures.
The output thermal conductivity is given as mW/(m K), Btu(IT)/(h ft °F), (Btu(IT) in)/(h ft 2 °F) and kcal(IT)/(h m K).