Air - Temperature, Pressure and Density

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Engineering ToolBox > Air - Temperature, Pressure and Density

Air density for pressures and temperatures ranging from 0 psi to 1000 psi and 30 to 600 deg F

Weight density of air (in pounds per cubic foot) for different gauge pressure (psi) can be found in the table below:

Density of air ¹⁾ (lb/ft³)
Air temperature (^oF)	Gauge Pressure (psi)
Air temperature (^oF)	0	5	10	20	30	40	50	60	70	80	90	100
30	0.081	0.109	0.136	0.192	0.247	0.302	0.357	0.412	0.467	0.522	0.578	0.633
40	0.080	0.107	0.134	0.188	0.242	0.295	0.350	0.404	0.458	0.512	0.566	0.620
50	0.078	0.105	0.131	0.185	0.238	0.291	0.344	0.397	0.451	0.504	0.557	0.610
60	0.076	0.102	0.128	0.180	0.232	0.284	0.336	0.388	0.440	0.492	0.544	0.596
70	0.075	0.101	0.126	0.177	0.228	0.279	0.330	0.381	0.432	0.483	0.534	0.585
80	0.074	0.099	0.124	0.174	0.224	0.274	0.324	0.374	0.424	0.474	0.524	0.574
90	0.072	0.097	0.121	0.171	0.220	0.269	0.318	0.367	0.416	0.465	0.515	0.564
100	0.071	0.095	0.119	0.168	0.216	0.264	0.312	0.361	0.409	0.457	0.505	0.554
120	0.069	0.092	0.115	0.162	0.208	0.255	0.302	0.348	0.395	0.441	0.488	0.535
140	0.066	0.089	0.111	0.156	0.201	0.246	0.291	0.337	0.382	0.427	0.472	0.517
150	0.065	0.087	0.109	0.154	0.198	0.242	0.287	0.331	0.375	0.420	0.464	0.508
200	0.060	0.081	0.101	0.142	0.183	0.244	0.265	0.306	0.347	0.388	0.429	0.470
250	0.056	0.075	0.094	0.132	0.170	0.208	0.246	0.284	0.322	0.361	0.399	0.437
300	0.052	0.070	0.088	0.123	0.159	0.195	0.230	0.266	0.301	0.337	0.372	0.408
400	0.046	0.062	0.078	0.109	0.141	0.172	0.203	0.235	0.266	0.298	0.329	0.360
500	0.041	0.056	0.070	0.098	0.126	0.154	0.182	0.210	0.238	0.267	0.295	0.323
600	0.038	0.050	0.063	0.089	0.114	0.140	0.165	0.190	0.216	0.241	0.267	0.292

Density of air ¹⁾ (lb/ft³)
Air temperature (^oF)	Gauge Pressure (psi)
Air temperature (^oF)	120	140	150	200	250	300	400	500	700	800	900	1000
30	0.743	0.853	0.909	1.185	1.460	1.736	2.29	1.84	3.94	4.49	5.05	5.60
40	0.728	0.836	0.890	1.161	1.431	1.702	2.24	2.78	3.86	4.40	4.95	5.49
50	0.717	0.823	0.876	1.142	1.408	1.674	2.21	2.74	3.80	4.33	4.87	5.40
60	0.700	0.804	0.856	1.116	1.376	1.636	2.16	2.68	3.72	4.24	4.76	5.28
70	0.687	0.789	0.840	1.095	1.350	1.605	2.12	2.63	3.65	4.16	4.67	5.18
80	0.674	0.774	0.824	1.075	1.325	1.575	2.08	2.58	3.58	4.08	4.58	5.08
90	0.662	0.760	0.809	1.055	1.301	1.547	2.04	2.53	3.51	4.00	4.50	4.99
100	0.650	0.747	0.795	1.036	1.278	1.519	2.00	2.48	3.45	3.93	4.42	4.90
120	0.628	0.721	0.768	1.001	1.234	1.467	1.933	2.40	3.33	3.80	4.26	4.73
140	0.607	0.697	0.742	0.967	1.193	1.418	1.868	2.32	3.22	3.67	4.12	4.57
150	0.597	0.686	0.730	0.951	1.173	1.395	1.838	2.28	3.17	3.61	4.05	4.50
200	0.552	0.634	0.675	0.879	1.084	1.289	1.698	2.11	2.93	3.34	3.75	4.16
250	0.513	0.589	0.627	0.817	1.088	1.198	1.579	1.959	2.72	3.10	3.48	3.86
300	0.479	0.550	0.586	0.764	0.941	1.119	1.475	1.830	2.54	2.90	3.25	3.61
400	0.423	0.486	0.518	0.675	0.832	0.989	1.303	1.618	2.25	2.56	2.87	3.19
500	0.379	0.436	0.464	0.604	0.745	0.886	1.167	1.449	2.01	2.29	2.58	2.86
600	0.343	0.394	0.420	0.547	0.675	0.802	1.057	1.312	1.822	2.08	2.33	2.59

¹⁾ Density is based on atmospheric pressure 14.696 psia and molecular weight of air 28.97

Density : 1 lb/ft³ = 16.018 kg/m³
Pressure: 1 psi (lb/in²) = 6,894.8 Pa (N/m²)
Temperature: T(^oC) = 5/9[T(^oF) - 32]
Unit Converter

Density of air can also be expressed as

ρ = 1.325 p_{in Hg} / T_R (1)

where

ρ = density (lb/ft³)

p_{in Hg}= pressure (inches Hg)

T_R= absolute temperature (Rankine)

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