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

Density , ρ, has units typically [kg/m3] or [lb/ft3], and is defined by the ratio of the mass to the volume of a substance:

ρ = m/V                      [1]

where     m = mass, units typically [kg] or [lb]
V = volume, units typically [m3 ] or [ft3 ]

Specific weight , γ, has units typically [N/m3 ] or [lbf /ft3 ]  is defined by the ratio of the weight to the volume of a substance:

γ = (m * g)/V = ρ * g                [2]

where    g = acceleration due to gravity, units typically [m/s2] and value on Earth usually given as 9.80665 [m/s2] or 32.17405 [ft/s2]

Tabulated values of hydrogen density at given temperature and pressure (SI and Imperial units) as well as density units conversion are given below the figures.

### Online Hydrogen Density Calculator

The calculator below can be used to estimate the density and specific weight of gaseous hydrogen at given temperature and atmospheric pressure (1 bara/14.5psia).
The output density is given as kg/m3, lb/ft3, lb/gal(US liq) and sl/ft3 .  Specific weight is given as N/m3 and lbf / ft3.

Choose the actual unit of temperature:

.
For calculation of density at higher pressure (up to 100 bara / 1450 psia), a good approximation is to multiply the density at 1 bara with the actual, higher pressure (in bara). If pressure is given in psia, you have to multiply the density at 14.5 psia with the actual higher pressure (in psia) and divide by 14.5.

Note! For pressure  between 20 and 100 bara, the error may be up to 7% by using this approximation (higher error, the higher pressure).

Example 1: Density of hydrogen at 5 bara and 24 °C.
Calculator gives the density at 24 °C and 1 bara: 0.0815 [kg/m3 ]
Density at 24°C and 5 bara : 0.0815 [kg/m3 ]* 5[bara]/1[bara] = 0.408 [kg/m3 ]

Example 2: Density of hydrogen at 725 psia and 125 °F.
Calculator gives the density at 125 °F and 14.5 psia: 0.00465 [lbm /ft3 ]
Density at 125°F and 725 psia : 0.00465 [lbm /ft3 ]* 725[psia]/14.5[psia] = 0.233 [lbm /ft3 ]
(this is 3% more than the below tabulated value of density at 125°F and 725 psia.)

See also other properties of Hydrogen at varying temperature and pressure: Specific heat (Heat capacity) and Thermal conductivity , and Thermophysical properties at standard conditions , as well as density and specific weight o f acetone , air , ammonia , argon , benzene , butane , carbon dioxide , carbon monoxide , ethane , ethanol , ethylene , helium , methane , methanol , nitrogen , oxygen , pentane , propane , toluene and water .
Density of crude oil , Density of fuel oils , Density of lubricating oil and Density of jet fuel as function of temperature.

.

Density and specific weight of hydrogen at given temperatures and pressures:

For full table with Denity and Specific Weight - rotate the screen!

Hydrogen - Density and Specific Weight vs. Temperature and Pressure
State Temperature Pressure Density Specific weight
[K] [°C] [°F] [MPa] [bara] [psia] [mol/dm3] [g/l],
[kg/m3]
[lbm /ft3] [sl/ft3 *10-3] [N/m3] [lbf /ft3]

Liquid at

equilibrium

pressure

13.96 -259.2 -434.5 0.00770 0.0770 1.12 38.15 76.91 4.801 149.2 754.2 4.801
14 -259 -434 0.00789 0.0789 1.14 38.13 76.87 4.799 149.1 753.8 4.799
16 -257 -431 0.0215 0.215 3.12 37.26 75.12 4.689 145.8 736.7 4.689
18 -255 -427 0.0481 0.481 6.97 36.32 73.22 4.571 142.1 718.1 4.571
20 -253 -424 0.0932 0.932 13.5 35.27 71.11 4.439 138.0 697.4 4.439
22 -251 -420 0.163 1.63 23.7 34.09 68.73 4.291 133.4 674.0 4.291
24 -249 -416 0.264 2.64 38.3 32.74 66.00 4.120 128.1 647.2 4.120
26 -247 -413 0.403 4.03 58.4 31.15 62.80 3.921 121.9 615.9 3.921
28 -245 -409 0.585 5.85 84.9 29.23 58.92 3.678 114.3 577.8 3.678
30 -243 -406 0.850 8.50 123 26.71 53.84 3.361 104.5 528.0 3.361
32 -241 -402 1.12 11.2 162 22.64 45.64 2.849 88.55 447.5 2.849
33.19 -240.0 -399.9 1.33 13.3 193 14.94 30.12 1.880 58.44 295.4 1.880
Gas at

equilibrium

pressure

13.96 -259.2 -434.5 0.00770 0.0770 1.12 0.06754 0.1362 8.50E-03 0.2642 1.335 8.50E-03
14 -259 -434 0.00789 0.0789 1.14 0.06902 0.1391 8.69E-03 0.2700 1.365 8.69E-03
16 -257 -431 0.0215 0.215 3.12 0.1676 0.3380 0.02110 0.6558 3.314 0.02110
18 -255 -427 0.0481 0.481 6.97 0.3413 0.6880 0.04295 1.335 6.747 0.04295
20 -253 -424 0.0932 0.932 13.5 0.6165 1.243 0.07759 2.412 12.19 0.07759
22 -251 -420 0.163 1.63 23.7 1.025 2.067 0.1290 4.010 20.27 0.1290
24 -249 -416 0.264 2.64 38.3 1.609 3.244 0.2025 6.294 31.81 0.2025
26 -247 -413 0.403 4.03 58.4 2.431 4.900 0.3059 9.508 48.06 0.3059
28 -245 -409 0.585 5.85 84.9 3.600 7.258 0.4531 14.08 71.18 0.4531
30 -243 -406 0.850 8.50 123 5.364 10.81 0.6751 20.98 106.1 0.6751
32 -241 -402 1.12 11.2 162 8.682 17.50 1.093 33.96 171.7 1.093
33.19 -240.0 -399.9 1.33 13.3 193 14.94 30.12 1.880

58.44

295.4 1.880
Liquid 20 -253 -424 0.1 1 14.5 35.29 71.14 4.441 138.0 698 4.44
20.23 -252.9 -423.3 0.1 1 14.5 35.16 70.88 4.425 137.5 695 4.42

Gas

20.23 -252.9 -423.3 0.1 1 14.5 0.6563 1.323 0.08259 2.567 13.0 0.0826
40 -233 -388 0.1 1 14.5 0.3054 0.6157 0.03844 1.195 6.04 0.0384
60 -213 -352 0.1 1 14.5 0.2013 0.4059 0.02534 0.7876 3.98 0.0253
80 -193 -316 0.1 1 14.5 0.1505 0.3035 0.01895 0.5889 2.98 0.0189
100 -173 -280 0.1 1 14.5 0.1203 0.2425 0.01514 0.4705 2.38 0.0151
120 -153 -244 0.1 1 14.5 0.1002 0.2020 0.01261 0.3919 1.98 0.0126
140 -133 -208 0.1 1 14.5 0.08586 0.1731 0.01081 0.3359 1.70 0.0108
160 -113 -172 0.1 1 14.5 0.07510 0.1514 0.009452 0.2938 1.48 0.00945
180 -93.2 -136 0.1 1 14.5 0.06677 0.1346 0.008403 0.2612 1.32 0.00840
200 -73.2 -99.7 0.1 1 14.5 0.06007 0.1211 0.007560 0.2350 1.19 0.00756
220 -53.2 -63.7 0.1 1 14.5 0.05461 0.1101 0.006873 0.2136 1.08 0.00687
240 -33.2 -27.7 0.1 1 14.5 0.05010 0.1010 0.006305 0.1960 0.990 0.00631
260 -13.2 8.3 0.1 1 14.5 0.04623 0.09319 0.005818 0.1808 0.914 0.00582
280 6.9 44.3 0.1 1 14.5 0.04293 0.08654 0.005403 0.1679 0.849 0.00540
300 26.9 80.3 0.1 1 14.5 0.04006 0.08077 0.005042 0.1567 0.792 0.00504
320 46.9 116 0.1 1 14.5 0.03756 0.07572 0.004727 0.1469 0.743 0.00473
340 66.9 152 0.1 1 14.5 0.03535 0.07127 0.004449 0.1383 0.699 0.00445
360 86.9 188 0.1 1 14.5 0.03339 0.06731 0.004202 0.1306 0.660 0.00420
400 127 260 0.1 1 14.5 0.03005 0.06058 0.003782 0.1175 0.594 0.00378
500 227 440 0.1 1 14.5 0.02404 0.04847 0.003026 0.09405 0.475 0.00303
600 327 620 0.1 1 14.5 0.02004 0.04040 0.002522 0.07839 0.396 0.00252
700 427 800 0.1 1 14.5 0.01718 0.03463 0.002162 0.06719 0.340 0.00216
800 527 980 0.1 1 14.5 0.01503 0.03030 0.001892 0.05879 0.297 0.00189
900 627 1160 0.1 1 14.5 0.01336 0.02693 0.001681 0.05225 0.264 0.00168
1000 727 1340 0.1 1 14.5 0.01202 0.02424 0.001513 0.04703 0.238 0.00151
Liquid 20 -253 -424 1 10 145 35.86 72.29 4.513 140.3 709 4.51
31.24 -241.9 -403.4 1 10 145 24.63 49.65 3.100 96.34 487 3.10

Gas

31.24 -241.9 -403.4 1 10 145 7.098 14.31 0.8933 27.77 140 0.893
40 -233 -388 1 10 145 3.606 7.270 0.4539 14.11 71.3 0.454
60 -213 -352 1 10 145 2.097 4.228 0.2639 8.204 41.5 0.264
80 -193 -316 1 10 145 1.524 3.072 0.1918 5.961 30.1 0.192
100 -173 -280 1 10 145 1.205 2.429 0.1516 4.713 23.8 0.152
120 -153 -244 1 10 145 0.9995 2.015 0.1258 3.910 19.8 0.126
140 -133 -208 1 10 145 0.8547 1.723 0.1076 3.343 16.9 0.108
160 -113 -172 1 10 145 0.7470 1.506 0.09402 2.922 14.8 0.0940
180 -93.2 -136 1 10 145 0.6637 1.338 0.08353 2.596 13.1 0.0835
200 -73.2 -99.7 1 10 145 0.5972 1.204 0.07516 2.336 11.8 0.0752
220 -53.2 -63.7 1 10 145 0.5432 1.095 0.06836 2.125 10.7 0.0684
240 -33.2 -27.7 1 10 145 0.4980 1.004 0.06268 1.948 9.85 0.0627
260 -13.2 8.3 1 10 145 0.4597 0.9267 0.05785 1.798 9.09 0.0579
280 6.9 44.3 1 10 145 0.4269 0.8607 0.05373 1.670 8.44 0.0537
300 26.9 80.3 1 10 145 0.3986 0.8035 0.05016 1.559 7.88 0.0502
320 46.9 116 1 10 145 0.3737 0.7534 0.04703 1.462 7.39 0.0470
340 66.9 152 1 10 145 0.3518 0.7093 0.04428 1.376 6.96 0.0443
360 86.9 188 1 10 145 0.3323 0.6700 0.04183 1.300 6.57 0.0418
400 127 260 1 10 145 0.2993 0.6033 0.03766 1.171 5.92 0.0377
500 227 440 1 10 145 0.2396 0.4830 0.03015 0.9372 4.74 0.0302
600 327 620 1 10 145 0.1998 0.4027 0.02514 0.7814 3.95 0.0251
700 427 800 1 10 145 0.1713 0.3454 0.02156 0.6702 3.39 0.0216
800 527 980 1 10 145 0.1500 0.3023 0.01887 0.5866 2.96 0.0189
900 627 1160 1 10 145 0.1333 0.2688 0.01678 0.5216 2.64 0.0168
1000 727 1340 1 10 145 0.1200 0.2420 0.01511 0.4696 2.37 0.0151
Liquid 25 -248 -415 5 50 725 35.66 71.89 4.488 139.5 705 4.49

Supercritical

phase
100 -173 -280 5 50 725 5.968 12.03 0.7511 23.35 118 5.98
175 -98.2 -145 5 50 725 3.313 6.679 0.4170 12.96 65.5 0.417
250 -23.2 -9.7 5 50 725 2.327 4.691 0.2928 9.102 46.0 0.293
325 51.9 125 5 50 725 1.799 3.627 0.2264 7.037 35.6 0.226
400 127 260 5 50 725 1.468 2.959 0.1848 5.742 29.0 0.185
Liquid 25 -248 -415 10 100 1450 37.93 76.47 4.774 148.4 750 4.77

Supercritical

phase

100 -173 -280 10 100 1450 11.42 23.02 1.437 44.66 226 1.44
175 -98.2 -145 10 100 1450 6.370 12.84 0.8017 24.92 126 0.802
250 -23.2 -9.7 10 100 1450 4.503 9.078 0.5667 17.61 89.0 0.567
325 51.9 125 10 100 1450 3.501 7.057 0.4406 13.69 69.2 0.441
400 127 260 10 100 1450 2.869 5.783 0.3610 11.22 56.7 0.361

Density units conversion:

Density converter

kilogram/cubic meter [kg/m3 ] = gram/liter [g/l], kilogram/liter [kg/l] = gram/cubic centimeter [g/cm3 ]= ton(metric)/cubic meter [t/m3 ], once/gallon(US liquid) [oz/gal(US liq)] pound/cubic inch [lb/in3 ], pound/cubic foot [lb/ft3 ], pound/gallon(UK) [lb/gal(UK)], pound/gallon(US liquid) [lb/gal(US liq)], slug/cubic foot [sl/ft3 ], ton(short)/cubic yard [ton(short)/yd3 ], ton(long)/cubic yard [yd3 ]

• 1 g/cm3 = 1 kg/l = 1000 kg/m3 = 62.428 lb/ft3 = 0.03613 lb/in3 = 1.9403 sl/ft3 = 10.0224 lb/gal(UK) = 8.3454 lb/gal(US liq) = 0.5780 oz/in3 = 0.7525 ton(long)/yr3
• 1 g/l = 1 kg/m3 = 0.001 kg/l = 0.000001 kg/cm3 = 0.001 g/cm3 = 0.99885 oz/ft3 = 0.0005780 oz/in3 = 0.16036 oz/gal(UK) = 0.1335 oz/gal(US liq) = 0.06243 lb/ft3 = 3.6127x10-5 lb/in3 = 1.6856 lb/yd3 = 0.010022 lb/gal(UK) = 0.0083454 lb/gal(US liq) = 0.0007525 ton(long)/yd3 = 0.0008428 ton(short)/yd3
• 1 kg/l = 1 g/cm3 = 1000 kg/m3 = 62.428 lb/ft3 = 0.03613 lb/in3 = 1.9403 sl/ft3 = 8.3454 lb/gal(US liq) = 0.5780 oz/in3 = 0.7525 ton(long)/yr3
• 1 kg/m3 = 1 g/l = 0.001 kg/l = 0.000001 kg/cm3 = 0.001 g/cm3 = 0.99885 oz/ft3 = 0.0005780 oz/in3 = 0.16036 oz/gal(UK) = 0.1335 oz/gal(US liq) = 0.06243 lb/ft3 = 3.6127x10-5 lb/in3 = 1.6856 lb/yd3 = 0.010022 lb/gal(UK) = 0.008345 lb/gal(US liq) = 0.0007525 ton(long)/yd3 = 0.0008428 ton(short)/yd3
• 1 lb/ft3 = 27 lb/yd3 = 0.009259 oz/in3 = 0.0005787 lb/in3 = 16.01845 kg/m3 = 0.01602 g/cm3 = 0.1605 lb/gal(UK) = 0.1349 lb/gal(US liq) = 2.5687 oz/gal(UK) = 2.1389 oz/gal(US liq) = 0.01205 ton(long)/yd3 = 0.0135 ton(short)/yd3
• 1 lb/gal(UK) = 0.8327 lb/gal(US liq) = 16 oz/gal(UK) = 13.323 oz/gal(US liq) = 168.179 lb/yd3 = 6.2288 lb/ft3 = 0.003605 lb/in3 = 0.05767 oz/in3 = 99.7764 kg/m3 = 0.09977 g/cm3 = 0.07508 ton(long)/yd3 = 0.08409 ton(short)/yd3
• 1 lb/gal(US liq) = 1.2009 lb/gal(UK) = 19.215 oz/gal(UK) = 16 oz/gal(US liq) = 201.97 lb/yd3 = 7.4805 lb/ft3 = 0.004329 lb/in3 = 0.06926 oz/in3 = 119.826 kg/m3 = 0.1198 g/cm3 = 0.09017 ton(long)/yd3 = 0.1010 ton(short)/yd3
• 1 lb/in3 = 1728 lb/ft3 = 46656 lb/yd3 = 16 oz/in3 = 27680 kg/m3 = 27.680 g/cm3 = 277.419 lb/gal(UK) = 231 lb/gal(US liq) =4438.7 oz/gal(UK) = 3696 oz/gal(US liq) = 20.8286 ton(long)/yd3 = 23.3280 ton(short)/yd3
• 1 oz/gal(UK) =  0.8327 oz/gal(US liq) = 6.2360 kg/m3 = 6.2288 oz/ft3 = 0.3893 lb/ft3 = 10.5112 lb/yd3
• 1 oz/gal(US liq) = 1.2009 oz/gal(UK) = 7.4892 kg/m3 = 7.4805 oz/ft3 = 0.4675 lb/ft3 = 12.6234 lb/yd3
• 1 sl/ft3 = 515.3788 kg/m3 = 514.7848 oz/ft3 = 0.2979 oz/in3 = 32.1741 lb/ft3 = 82.645 oz/gal(UK) = 68.817 oz/gal(US liq)
• 1 ton(long)/yd3 = 1.12 ton(short)/yd3 = 1328.94 kg/m3 = 0.7682 oz/in3 = 82.963 lb/ft3 = 2240 lb/yd3 = 2.5786 sl/ft3 = 13.319 lb/gal(UK) = 11.0905 lb/gal(US liq)
• 1 ton(short)/yd3 = 0.8929 ton(long)/yd3 = 1186.55 kg/m3 = 0.6859 oz/in3 = 74.074 lb/ft3 = 2000 lb/yd3 = 2.3023 sl/ft3 = 11.8921 lb/gal(UK) = 9.9023 lb/gal(US liq)

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