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# Hydrogen - Thermal Conductivity vs. Temperature and Pressure

## 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].

Thermal conductivity unit converter

The thermal conductivity of hydrogen depends on temperature and pressure as shown in the figures and table below.

Hydrogen phase diagram

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).

Choose the actual unit of temperature:

See also other properties of hydrogen at varying temperature and pressure: Density and specific weight and Specific heat (heat capacity) ,  and Thermophysical properties at standard conditions ,
as well as thermal conductivity o f air , ammonia , butane , carbon dioxide , ethane , ethylene , methane , nitrogen , propane and water . For thermal conductivity of construction materials, see related documents at the bottom of the page.

Thermal conductivity of normal hydrogen as function of temperature and pressure, given as °C and °F:

Thermal conductivity of para hydrogen as function of temperature and pressure, given as °C and °F:

Thermal conductivity of para hydrogen at gas-liquid equilibrium pressure and varying temperature, given as °C and °F:

Thermal conductivity of para and normal hydrogen at given temperatures and pressure, SI and Imperial units:

For full table Hydrogen Thermal Conductivity - rotate the screen!

 State Temperature Pressure Para Hydrogen - Thermal Conductivity Normal Hydrogen - Thermal Conductivity [K] [°C] [°F] [bar] [psi] [mW/m K] [kcal(IT)/(h m K)] [Btu(IT)/(h ft °F)] [mW/m K] [kcal(IT)/(h m K)] [Btu(IT)/(h ft °F)] Liquid at equilibrium 13.80 -259.35 -434.83 0.0704 1.02 75.3 0.0647 0.0435 13.96 -259.19 -434.55 0.0770 1.12 76.3 0.0656 0.0441 14 -259 -434 0.0789 1.14 76.9 0.0661 0.0444 76.7 0.0659 0.0443 16 -257 -431 0.215 3.12 90.0 0.0774 0.0520 90.1 0.0775 0.0520 18 -255 -427 0.481 6.97 98.4 0.0846 0.0568 98.4 0.0846 0.0569 20 -253 -424 0.932 13.5 103 0.0886 0.0595 103 0.0886 0.0595 22 -251 -420 1.63 23.7 105 0.0902 0.0606 105 0.0903 0.0607 24 -249 -416 2.64 38.3 105 0.0900 0.0605 105 0.0899 0.0604 26 -247 -413 4.03 58.4 103 0.0882 0.0593 103 0.0882 0.0592 28 -245 -409 5.85 84.9 98.8 0.0849 0.0571 98.7 0.0848 0.0570 30 -243 -406 8.50 123 92.8 0.0798 0.0536 92.5 0.0796 0.0535 32 -241 -402 11.2 162 82.5 0.0710 0.0477 82.2 0.0707 0.0475 Gas at equilibrium 13.80 -259.35 -434.83 0.0704 1.02 10.5 0.00899 0.00604 13.96 -259.19 -434.55 0.0770 1.12 10.4 0.00892 0.00599 14 -259 -434 0.0789 1.14 10.7 0.00916 0.00615 10.4 0.00897 0.00603 16 -257 -431 0.215 3.12 12.6 0.0108 0.00728 12.7 0.0109 0.00733 18 -255 -427 0.481 6.97 14.6 0.0126 0.00844 14.7 0.0126 0.00848 20 -253 -424 0.932 13.5 16.7 0.0144 0.0097 16.7 0.0144 0.00966 22 -251 -420 1.63 23.7 19.0 0.0163 0.0110 19.0 0.0163 0.0110 24 -249 -416 2.64 38.3 21.5 0.0185 0.0124 21.5 0.0185 0.0124 26 -247 -413 4.03 58.4 24.5 0.0211 0.0142 24.5 0.0210 0.0141 28 -245 -409 5.85 84.9 28.3 0.0243 0.0163 28.2 0.0242 0.0163 30 -243 -406 8.50 123 33.5 0.0288 0.0193 33.4 0.0287 0.0193 32 -241 -402 11.2 162 43.2 0.0371 0.0249 43.2 0.0371 0.0250 Liquid 20 -253 -424 1 14.5 103 0.0887 0.0596 20.23 -252.9 -423.3 1 14.5 103 0.0889 0.0597 20.23 -252.9 -423.3 1 14.5 17.0 0.0146 0.0098 25 -248 -415 1 14.5 20.8 0.0179 0.0120 40 -233 -388 1 14.5 31.9 0.0274 0.0184 60 -213 -352 1 14.5 45.5 0.0391 0.0263 80 -193 -316 1 14.5 61.4 0.0528 0.0355 100 -173 -280 1 14.5 80.4 0.0692 0.0465 68.3 0.0588 0.0395 120 -153 -244 1 14.5 101 0.0872 0.0586 140 -133 -208 1 14.5 120 0.103 0.0692 160 -113 -172 1 14.5 135 0.116 0.0779 175 -98.2 -145 1 14.5 117 0.101 0.0677 180 -93.2 -136 1 14.5 147 0.126 0.0846 200 -73.2 -99.7 1 14.5 156 0.134 0.0899 220 -53.2 -63.7 1 14.5 163 0.140 0.0944 240 -33.2 -27.7 1 14.5 171 0.147 0.0986 250 -23.2 -9.7 1 14.5 161 0.138 0.0928 260 -13.2 8.3 1 14.5 178 0.153 0.103 280 6.9 44.3 1 14.5 185 0.159 0.107 300 26.9 80.3 1 14.5 192 0.165 0.111 320 46.9 116 1 14.5 200 0.172 0.116 325 51.9 125 1 14.5 198 0.170 0.114 340 66.9 152 1 14.5 208 0.179 0.120 360 86.9 188 1 14.5 216 0.186 0.125 400 127 260 1 14.5 233 0.200 0.135 234 0.201 0.135 500 227 440 1 14.5 275 0.236 0.159 600 327 620 1 14.5 318 0.273 0.184 700 427 800 1 14.5 361 0.310 0.208 800 527 980 1 14.5 405 0.348 0.234 900 627 1160 1 14.5 449 0.386 0.260 1000 727 1340 1 14.5 494 0.425 0.286 Liquid 20 -253 -424 10 145 105 0.0904 0.0607 25 -248 -415 10 145 107 0.0918 0.0617 31.24 -241.9 -403.4 10 145 87.3 0.0750 0.0504 86.8 0.0747 0.0502 Gas 31.24 -241.9 -403.4 10 145 38.4 0.0331 0.0222 40 -233 -388 10 145 37.3 0.0321 0.0215 60 -213 -352 10 145 48.4 0.0416 0.0280 80 -193 -316 10 145 63.7 0.0548 0.0368 100 -173 -280 10 145 82.5 0.0709 0.0477 70.4 0.0605 0.0407 120 -153 -244 10 145 103 0.0887 0.0596 140 -133 -208 10 145 121 0.104 0.0700 160 -113 -172 10 145 136 0.117 0.0786 175 -98.2 -145 10 145 118 0.102 0.0684 180 -93.2 -136 10 145 148 0.127 0.0853 200 -73.2 -99.7 10 145 157 0.135 0.0905 220 -53.2 -63.7 10 145 164 0.141 0.0949 240 -33.2 -27.7 10 145 172 0.147 0.0991 250 -23.2 -9.7 10 145 161 0.139 0.0933 260 -13.2 8.3 10 145 179 0.154 0.103 280 6.9 44.3 10 145 186 0.160 0.107 300 26.9 80.3 10 145 193 0.166 0.112 320 46.9 116 10 145 201 0.173 0.116 325 51.9 125 10 145 198 0.171 0.115 340 66.9 152 10 145 209 0.179 0.121 360 86.9 188 10 145 217 0.187 0.125 400 127 260 10 145 234 0.201 0.135 235 0.202 0.136 500 227 440 10 145 276 0.237 0.159 600 327 620 10 145 318 0.273 0.184 700 427 800 10 145 361 0.311 0.209 800 527 980 10 145 405 0.348 0.234 900 627 1160 10 145 450 0.387 0.260 1000 727 1340 10 145 495 0.425 0.286 Liquid 25 -248 -415 50 725 119 0.103 0.0690 Supercritical phase 100 -173 -280 50 725 80.4 0.069 0.0465 175 -98.2 -145 50 725 124 0.106 0.0714 250 -23.2 -9.7 50 725 165 0.142 0.0954 325 51.9 125 50 725 201 0.173 0.116 400 127 260 50 725 237 0.204 0.137 Liquid 20 -253 -424 100 1450 120 0.103 0.0695 25 -248 -415 100 1450 131 0.113 0.0758 Supercritical phase 40 -233 -388 100 1450 122 0.105 0.0704 60 -213 -352 100 1450 101 0.0865 0.0581 80 -193 -316 100 1450 96.7 0.0832 0.0559 100 -173 -280 100 1450 106 0.0914 0.0614 94.2 0.080994 0.0544 120 -153 -244 100 1450 122 0.105 0.0703 140 -133 -208 100 1450 137 0.117 0.0789 160 -113 -172 100 1450 149 0.128 0.0863 175 -98.2 -145 100 1450 130 0.112 0.0753 180 -93.2 -136 100 1450 159 0.137 0.0921 200 -73.2 -100 100 1450 167 0.144 0.0967 220 -53.2 -63.7 100 1450 174 0.150 0.100 240 -33.2 -27.7 100 1450 180 0.155 0.104 250 -23.2 -9.7 100 1450 170 0.146 0.0982 260 -13.2 8.3 100 1450 187 0.161 0.108 280 6.9 44.3 100 1450 193 0.166 0.112 300 26.9 80.3 100 1450 200 0.172 0.116 320 46.9 116 100 1450 207 0.178 0.120 325 51.9 125 100 1450 205 0.176 0.118 340 66.9 152 100 1450 215 0.185 0.124 360 86.9 188 100 1450 223 0.192 0.129 400 127 260 100 1450 239 0.206 0.138 240 0.206 0.139 500 227 440 100 1450 280 0.241 0.162 600 327 620 100 1450 322 0.277 0.186 700 427 800 100 1450 365 0.314 0.211 800 527 980 100 1450 408 0.351 0.236 900 627 1160 100 1450 452 0.389 0.261 1000 727 1340 100 1450 497 0.428 0.287 Supercritical phase 100 -173 -280 500 7252 192 0.165 0.111 175 -98.2 -145 500 7252 190 0.163 0.110 250 -23.2 -9.7 500 7252 212 0.182 0.122 325 51.9 125 500 7252 238 0.204 0.137 400 127 260 500 7252 267 0.230 0.154
Thermal conductivity unit converter

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The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
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## Related Documents

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• The Engineering ToolBox (2018). Hydrogen - Thermal Conductivity vs. Temperature and Pressure. [online] Available at: https://www.engineeringtoolbox.com/hydrogen-H2-thermal-conductivity-temperature-pressure-d_2106.html [Accessed Day Month Year].

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