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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 .

See also other properties of Air at varying temperature and pressure: Density and specific weight at varying temperature , Density at varying pressure , Diffusion Coefficients for Gases in Air , Prandtl Number , Specific heat at varying temperature and Specific heat at varying pressure , Thermal Conductivity , Properties at gas-liquid equilibrium conditions and Air thermophysical properties at standard conditions and Composition and molecular weight ,
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:

Air - Thermal Diffusivity vs. Temperature and Pressure - Atmospheric Pressure
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:

Air - Thermal Diffusivity vs. Temperature and Pressure
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

Moist and humid air calculations. Psychrometric charts and Mollier diagrams. Air-condition systems temperatures, absolute and relative humidities and moisture content in air.
• ### Fluid Mechanics

The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
• ### Gases and Compressed Air

Properties of air, LNG, LPG and other common gases. Pipeline capacities and sizing of relief valves.
• ### Material Properties

Properties of gases, fluids and solids. Densities, specific heats, viscosities and more.

## Related Documents

• ### Air - Composition and Molecular Weight

Dry air is a mechanical mixture of nitrogen, oxygen, argon and several other gases in minor amounts.
• ### Air - Density vs. Pressure and Temperatures

Air density at pressure ranging 1 to 10 000 bara (14.5 - 145000 psi) and constant selected temperatures.
• ### Air - Density, Specific Weight and Thermal Expansion Coefficient vs. Temperature and Pressure

Online calculator, figures and tables showing density, specific weight and thermal expansion coefficients of air at temperatures ranging -100 to 1600 °C (-140 to 2900 °F) at atmospheric and higher pressure - Imperial and SI Units.
• ### Air - Diffusion Coefficients of Gases in Excess of Air

Diffusion coefficients (D12) for gases in large excess of air at temperatures ranging 0 - 400 °C.
• ### Air - Dynamic and Kinematic Viscosity

Online calculator, figures and tables with dynamic (absolute) and kinematic viscosity for air at temperatures ranging -100 to 1600°C (-150 to 2900°F) and at pressures ranging 1 to 10 000 bara (14.5 - 145000 psia) - SI and Imperial Units.
• ### Air - Humidity Ratio

The mass of water vapor present in moist air - to the mass of dry air.
• ### Air - Moisture Holding Capacity vs. Temperature

The moisture holding capacity of air increases with temperature.
• ### Air - Molecular Weight and Composition

Dry air is a mixture of gases where the average molecular weight (or molar mass) can be calculated by adding the weight of each component.
• ### Air - Prandtl Number

Prandtl number for air vs. temperature and pressure.
• ### Air - Properties at Gas-Liquid Equilibrium Conditions

Properties of air change along the boiling and condensation curves (temperature and pressure between triple point and critical point conditions). An air phase diagram included.
• ### Air - Specific Heat vs. Pressure at Constant Temperature

Figures and tables with isobaric (Cp) and isochoric (Cv) specific heat of air at constant temperature and pressure ranging 0.01 to 10000 bara.
• ### Air - Specific Heat vs. Temperature at Constant Pressure

Online calculator with figures and tables showing specific heat (Cp and Cv) of dry air vs. temperature and pressure. SI and imperial units.
• ### Air - Speed of Sound vs. Temperature

Speed of sound in air at standard atmospheric pressure with temperatures ranging -40 to 1000 °C (-40 to 1500 °F) - Imperial and SI Units.
• ### Air - Thermal Conductivity vs. Temperature and Pressure

Online calculator with figures and tables showing air thermal conductivity vs. temperature and pressure. SI and imperial units.
• ### Air - Thermophysical Properties

Thermal properties of air at different temperatures - density, viscosity, critical temperature and pressure, triple point, enthalpi and entropi, thermal conductivity and diffusivity and more.
• ### Air Conditioning - Cooling of Air and Condensate Generated

Water may condensate when air is cooled in air conditioning systems.
• ### Air Properties - SI Units

Ideal gas properties of air at low pressure - SI units.
• ### Compressed Air - Pressure Drop Diagrams, Metric Units

Pressure loss in compressed air pipe lines.
• ### Dry Air - Thermodynamic and Physical Properties

Thermodynamic properties of dry air - specific heat, ratio of specific heats, dynamic viscosity, thermal conductivity, Prandtl number, density and kinematic viscosity at temperatures ranging 175 - 1900 K.
• ### Gases Solved in Water - Diffusion Coefficients

Diffusion flux [kg/m2s] tells how fast a substanse solved in another substance flows due to concentration gradients. Diffusion constants [m2/s] for several gases in water.
• ### Moist Air - Properties

Psychrometric table with humid air properties like saturation pressure, specific volume, enthalpy and entropy.
• ### Moist Air - Specific Volume

Specific volume of moist air is defined as the total volume of humid air per mass unit of dry air
• ### Moist Air - Weight of Water Vapor

Weight of water vapor in air
• ### Nitrogen - Thermal Diffusivity vs. Temperature and Pressure

Figures and tables showing thermal diffusivity of nitrogen at varying temperarure and pressure, SI and Imperial units.
• ### Solubility of Air in Water

The amount of air that can be dissolved in water decreases with temperature and increases with pressure.
• ### Water - Thermal Diffusivity vs. Temperature and Pressure

Figures and tables with thermal diffusivity of liquids and gaseous water at varying temperarures and pressures - SI and Imperial units.

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## Citation

• The Engineering ToolBox (2018). Air - Thermal Diffusivity vs. Temperature and Pressure. [online] Available at: https://www.engineeringtoolbox.com/air-thermal-diffusivity-d_2011.html [Accessed Day Month Year].

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6.3.17

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