Air - Temperature, Pressure and Density

Air density for pressure range 0 - 1000 psi and temperature range 30 - 600 deg F

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Weight or density of air (pounds per cubic foot) for different gage pressures (psi):

Density of air 1) (lb/ft3)
Air temperature
(oF)
Gauge Pressure (psi)
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 0.225 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)
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 2.84 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

Air - density versus temperature and pressure

 

The density of air can be calculated as

ρ = 1.325 pin Hg / TR         

   = 2.7 ppsia / TR      

   = 2.7 (ppsig + 14.7) / (TF + 459.7)                                                    (1)

where

ρ = density (lb/ft3)

pin Hg = absolute pressure (inches Hg)

TR = absolute temperature (Rankine)

ppsia = absolute pressure (psia)

ppsig = gage pressure (psig)

TF = temperature (oF)

Example - Weight of Air

The density of air at pressure 29.92 inches Hg at 100 degrees F can be calculated as

ρ = 1.325 (29.92 inches Hg) / ((100 oF) + 459.7)     

   = 0.0708 lb/ft3

The weight of 10 ft3 air can be calculated as

W = (10 ft3) (0.071 lb/ft3)

    = 0.708 lb

Related Topics

  • Fluid Mechanics - The study of fluids - liquids and gases. Involves velocity, pressure, density and temperature as functions of space and time
  • Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more
  • Density - Density of different solid materials, liquids and gases. Definitions and convertion calculators.

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