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# Hydrogen - Thermal Conductivity vs. Temperature and Pressure

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 ft2°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!

Hydrogen - Thermal Conductivity vs. Temperature and Pressure
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

## Related Topics

### • Fluid Mechanics

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

### • Material Properties

Properties of gases, fluids and solids. Densities, specific heats, viscosities and more.

### • Thermodynamics

Work, heat and energy systems.

## Related Documents

### Air - Thermal Conductivity vs. Temperature and Pressure

Online calculator with figures and tables showing air thermal conductivity vs. temperature and pressure. SI and imperial units.

### Ammonia - Thermal Conductivity vs. Temperature and Pressure

Online calculator, figures and tables showing thermal conductivity of liquid and gaseous ammonia at temperatures ranging -70 to 425 °C (-100 to 800 °F) at atmospheric and higher pressure - Imperial and SI Units.

### Carbon dioxide - Thermal Conductivity vs. Temperature and Pressure

Online calculator, figures and table showing thermal conductivity of carbon dioxide, CO2, at temperatures ranging from -50 to 775 °C (-50 to 1400 °F) at atmospheric and higher pressure - Imperial and SI Units.

### Conductive Heat Transfer

Conductive heat transfer takes place in a solid if there is a temperature gradient.

### Ethane - Thermal Conductivity vs. Temperature and Pressure

Online calculator, figures and table showing thermal conductivity of ethane, C2H6, at varying temperature and pressure - Imperial and SI Units.

### Ethylene - Thermal Conductivity vs. Temperature and Pressure

Online calculator, figures and table showing thermal conductivity of ethylene, also called ethene or acetene, C2H4, at varying temperature and pressure - Imperial and SI Units.

### Heat Exchanger Materials - Thermal Conductivities

Typical heat exchanger materials and their thermal conductivities.

### Hydrogen - Density and Specific Weight vs. Temperature and Pressure

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.

### Hydrogen - Thermophysical Properties

Chemical, Physical and Thermal Properties of Hydrogen - H2.

### Liquids - Thermal Conductivities

Some fluids and their thermal conductivities.

### Metals, Metallic Elements and Alloys - Thermal Conductivities

Thermal conductivities of common metals, metallic elements aand alloys.

### Methane - Thermal Conductivity vs. Temperature and Pressure

Online calculator, figures and table showing thermal conductivity of methane, CH4, at temperatures ranging from -160 to 725 °C (-260 to 1300 °F) at atmospheric and higher pressure - Imperial and SI Units.

### Nitrogen - Thermal Conductivity vs. Temperature and Pressure

Online calculator, figures and tables showing thermal conductivity of nitrogen, N2, at varying temperarure and pressure, SI and Imperial units.

### Pipes and Cylinders - Conductive Heat Losses

Conductive heat losses through cylinder or pipe walls.

### Plastics - Thermal Conductivity Coefficients

Thermal conductivity of plastics.

### Propane - Thermal Conductivity vs. Temperature and Pressure

Online calculator, figures and tables showing thermal conductivity of liquid and gaseous propane at varying temperarure and pressure, SI and Imperial units.

### Solids, Liquids and Gases - Thermal Conductivities

Thermal conductivity coefficients for insulation materials, aluminum, asphalt, brass, copper, steel, gases and more.

### Thermal Conductivity - Online Converter

Convert between thermal conductivity units.

### Thermal Conductivity Unit Converter

Convert between thermal conductivity units - table and diagram.

### Thermal Resistivity and Conductivity

The ability of a material to resist flow of heat.

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