Density and Specific Weight vs. Temperature and Pressure (2024)

Density , ρ, hasunits 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 [lb_f /ft³ ] is defined by the ratio of the weight to the volume of a substance:

γ = (m * g)/V = ρ * g [2]

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 lb_f / ft³.

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
State	[K]	[°C]	[°F]	[MPa]	[bara]	[psia]	[mol/dm³]	[g/l], [kg/m³]	[lb_m /ft³]	*[sl/ft³ 10^-3]**	[N/m³]	[lb_f /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
Liquid	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
Liquid	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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Density and Specific Weight vs. Temperature and Pressure (2024)

FAQs

What is the relationship between density and temperature and pressure? ›

At temperature T1 which is higher than T2, the density is less for the same amount of pressure due to the volume being more at higher temperature. It shows that at the constant temperature the density increases with the increases in pressure. Likewise, density decreases with decrease in pressure.

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What is the relationship between density and specific weight? ›

density is simly mass per unit volume of a body,where as specific weight is the weight per unit volume of a body. So, specific weight has a “g” term associated with it.

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How to solve for density with pressure and temperature? ›

The ideal gas law is given by: PV = gRT/M, where P = pressure, V= volume, T = temperature, g = weight of the gas R = the ideal gas constant. This equation may be rearranged to give the density of the gas : r = g/V = PM/RT.

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Does more density mean more pressure? ›

Pressure and Density Relationship

When density increases, pressure increases. When density decreases, the pressure decreases.

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What is the relationship between pressure and specific weight? ›

Relation between specific weight and pressure: The pressure at a certain depth in a fluid is directly proportional to the specific weight of the fluid and the depth. This relationship can be expressed by the formula: P = γh, where P is the pressure, γ is the specific weight of the fluid, and h is the depth.

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Is there a relationship between pressure and density? ›

Pressure and density have a direct relationship, meaning that if one increases, so does the other. This also means that pressure is directly proportional to the number of moles, but inversely proportional (one goes up, the other goes down) to volume, since volume is in the denominator.

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What is the correlation between density and weight? ›

So to find the weight of an object, you multiply its density by its volume. if objects have the same volume, the object with the largest density will weigh the most. But smaller objects with a high density can be lighter than larger objects with a small density.

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How to convert specific weight to density? ›

Density is the amount of mass in a given volume, usually expressed in grams per cubic centimeter (gr/cm^3). Specific weight is the weight of mass in a given volume. To convert specific weight to density simply divide the specific weight by the gravitational acceleration (9.807 m/s^2).

What is the difference between density and specific? ›

Density is defined as mass per unit volume. It has the SI unit kg m^-³ or kg/m³ and is an absolute quantity. Specific gravity is the ratio of a material's density with that of water at 4 °C (where it is most dense and is taken to have the value 999.974 kg m^-³).

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What is the density at standard temperature and pressure? ›

In Metric units: 1.225 kg/m^3. In Imperial units: 0.0765 lb/ft^3.

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What is the formula for pressure and density? ›

Pressure due to the weight of a liquid of constant density is given by p=ρgh p = ρ g h , where p is the pressure, h is the depth of the liquid, ρ is the density of the liquid, and g is the acceleration due to gravity.

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How to convert pressure to density? ›

First, rearrange the Ideal Gas Law to solve for n/V (which is the density in moles per volume): n/V = P/RT Then, to convert this to a mass density (in g/L for example), multiply by the molar mass (M) of the gas: Density = MP/RT Here, M is the molar mass of the gas, P is the pressure (in atm), R is the ideal gas ...

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What is the relationship between temperature pressure and density? ›

Density = P*M/(R*T), where P is pressure in Pascal, M is average molecular weight, R is gas constant and T is temperature..

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What is the relationship between temperature and pressure? ›

Gay-Lussac's law states that the pressure of a gas is directly proportional to the absolute temperature provided the volume and amount of gas are not changed. Figure 7.4. 1: Increasing temperature increases pressure, i.e., P1T1=P2T2.

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Does lower density mean lower pressure? ›

Pressure has the opposite effect on air density. Increasing the pressure increases the density. Think of what happens when you press down the handle of a bicycle pump. The air is compressed.