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# Air - Thermal Diffusivity vs. Temperature and Pressure

## Figures and tables withdry air thermal diffusivity vs. temperarure and pressure. SI and Imperial units.

Thermal diffusivity is the rate of transfer of heat of a material from the hot side to the cold side - a measure of how quickly a material can absorb heat from its surroundings. It can be calculated by taking the thermal conductivity divided by density and specific heat capacity at constant pressure.

Thermal diffusivity has the SI derived unit of [m²/s], and is usually denoted α but a, κ, K, and D are also used. The formula is:

α =k /(ρ CP)            [1]

where
k = is thermal conductivity [W/(m·K)]
ρ = density [kg/m³]
CP = specific heat capacity [J/(kg·K)]

Below, thermal diffusivity for air at varying temperatures and pressures are given in figures and tables.

as well as thermal diffusivity of nitrogen, propane and water.

Air thermal diffusivity at 1 bara pressure, temperature given as °C or °F:

Air thermal diffusivity at varying temperatures and constant pressures, SI and Imperial units:

Air thermal diffusivity at atmospheric pressure, given in SI and Imperial units:

 Temperature Thermal diffusivity Temperature Thermal diffusivity [K] [°C] [x10-6 m2/s] [m2/h] [K] [°F] [x10-5 ft2/s] [ ft2/h] 173.2 -100 7.88 0.02837 172.0 -150 8.371 0.3014 223.2 -50 13.02 0.04686 213.7 -75 12.89 0.4640 243.2 -30 15.33 0.05518 227.6 -50 14.55 0.5238 253.2 -20 16.54 0.05953 241.5 -25 16.29 0.5863 263.2 -10 17.78 0.06401 249.8 -10 17.36 0.6251 268.2 -5 18.41 0.06629 255.4 0 18.09 0.6514 273.2 0 19.06 0.06860 260.9 10 18.84 0.6782 278.2 5 19.71 0.07094 266.5 20 19.59 0.7053 283.2 10 20.36 0.07331 283.2 50 21.92 0.7891 293.2 20 21.70 0.07813 297.0 75 23.93 0.8615 298.2 25 22.39 0.08059 310.9 100 26.01 0.9363 303.2 30 23.07 0.08307 324.8 125 28.15 1.013 323.2 50 25.91 0.09327 338.7 150 30.34 1.092 348.2 75 29.61 0.1066 366.5 200 34.92 1.257 373.2 100 33.49 0.1206 394.3 250 39.71 1.430 398.2 125 37.53 0.1351 422.0 300 44.71 1.610 423.2 150 41.73 0.1502 449.8 350 49.91 1.797 448.2 175 46.07 0.1659 477.6 400 55.30 1.991 473.2 200 50.56 0.1820 505.4 450 60.86 2.191 523.2 250 59.93 0.2157 533.2 500 66.59 2.397 573.2 300 69.79 0.2512 588.7 600 78.52 2.827

Air thermal diffusivity at given temperatures and 1, 5 10 and 20 bara presure:

 Temperature Thermal diffusivity at given pressures [x10-6 m2/s ] [K] [°C] [°F] 1 bara,14.5 psia 5 bara,72.5 psia 10 bara,145 psia 20 bara,145 psia 60 -213 -352 0.0941 0.0942 0.0944 0.0947 80 -193 -316 1.59 0.0823 0.0826 0.0834 100 -173 -280 2.56 0.408 0.0643 0.0659 120 -153 -244 3.79 0.684 0.293 0.0814 140 -133 -208 5.21 0.983 0.455 0.189 180 -93.2 -136 8.58 1.68 0.815 0.385 200 -73.2 -99.7 10.5 2.07 1.02 0.490 220 -53.2 -63.7 12.6 2.50 1.23 0.602 240 -33.2 -27.7 14.9 2.96 1.46 0.721 260 -13.2 8.3 17.3 3.44 1.67 0.847 273.2 0.0 32.0 19.0 3.78 1.86 0.940 280 6.9 44.3 19.9 3.96 1.97 0.979 288.7 15.6 60.0 21.0 4.20 2.10 1.05 300 26.9 80.3 22.6 4.50 2.25 1.12 320 46.9 116 25.4 5.07 2.53 1.26 340 66.9 152 28.3 5.67 2.83 1.41 360 86.9 188 31.4 6.28 3.14 1.57 380 107 224 34.6 6.92 3.46 1.73 400 127 260 37.9 7.58 3.79 1.90 500 227 440 55.7 11.2 5.59 2.80 600 327 620 75.4 15.1 7.57 3.80 700 427 800 96.8 19.4 9.71 4.88 800 527 980 119.7 24.0 12.0 6.03 900 627 1160 144.2 28.9 14.5 7.26 1000 727 1340 169.6 34.1 17.1 8.57 1100 827 1520 198.1 19.9 1500 1227 2240 326.7 32.7 1900 1627 2960 483.7 48.5

## Related Topics

• Air Psychrometrics - The study of moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content
• Fluid Mechanics - The study of fluids - liquids and gases. Involves velocity, pressure, density and temperature as functions of space and time
• Gases and Compressed Air - Air, LNG, LPG and other common gas properties, pipeline capacities, sizing of relief valves
• Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more

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## Unit Converters

Temperature

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Length

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