Air Density Table and Specific Weight Table, Equations and Calculator

Air Density Table and Specific Weight Equations and Calculator

Engineering Calculators
Engineering Physics

Air Density and Specific Weight Table, Equations and Calculator:

The density of air, ρ (Greek: rho) (air density), is the mass per unit volume of Earth's atmosphere. Air density, like air pressure, decreases with increasing altitude. It also changes with variation in temperature or humidity. At sea level and at 15 °C, air has a density of approximately 1.225 kg/m³ (0.001225 g/cm³, 0.0023769 slug/ft³, 0.0765 lbm/ft³) according to ISA (International Standard Atmosphere).

Specific weight and density of air at standard atmospheric pressure - Imperial Units:

Temperature °F	Density slugs/ft³	Specific Weight lb/ft³
-40	.002939	.09456
-20	.002805	.09026
0	.002683	.08633
10	.002626	.08449
20	.002571	.08273
30	.002519	.08104
40	.002469	.07942
50	.002420	.07786
60	.002373	.07636
70	.002329	.07492
80	.002286	.07353
90	.002244	.07219
100	.002204	.07090
120	.002128	.06846
140	.002057	.06617
160	.001990	.06404
180	.001928	.06204
200	.001870	.06016
250	.001756	.05598
300	.001624	.05224
400	.001435	.04616
500	.001285	.04135
750	.001020	.03280
1,000	.000845	.02717
1,500	.000629	.02024

Specific weight and density of air at standard atmospheric pressure - SI Units:

Temperature °C	Density kg/m³	Specific Weight N/m³
-40	1.514	14.85
-20	1.395	13.68
0	1.293	12.67
5	1.269	12.45
10	1.247	12.23
15	1.225	12.01
20	1.204	11.81
25	1.184	11.61
30	1.165	11.43
40	1.127	11.05
50	1.109	10.88
60	1.060	10.40
70	1.029	10.09
80	0.9996	9.803
90	0.9721	9.533
100	0.9461	9.278
200	0.7461	7.317
300	0.6159	6.040
400	0.5243	5.142
500	0.4565	4.477
1000	0.2772	2.719