Thermal nature of air at various temperatures - density, viscosity, crucial temperature and also pressure, triple point, enthalpi and entropi, heat conductivity and diffusivity and also more.

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Thermophysical nature of air:

cook temperature (at 1 bara): 78.8 K = -194.4 °C = -317.8 °F Condensation temperature (at 1 bara): 81.8 K = -191.4 °C = -312.5 °F crucial density: 10.448 mol/dm3 = 302.6 kg/m3 = 0.5871 slug/ft3 = 18.89 lbm/ft3 density (at 60°F and also 1 atm): 1.208 kg/m3 = 0.00234 slug/ft3 = 0.0754 lb/ft3 Enthalpy (heat) that air in ~ 0°C and also 1 bara: 11.57 kJ/mol = 399.4 kJ/kg = 171.7 Btu(IT)/lb Entropy of air at 0°C and also 1 bara: 0.1100 kJ/mol K = 3.796 kJ/kg K = 0.9067 Btu(IT)/lb °F Liquid density at boiling point and 1 bar: 875.50 kg/m3 = 54.656 lb/ft3 heat conductivity in ~ 0°C and 1 bara: 24.35 mW/(m K) = 0.02094 kcal(IT)/(h m K) = 0.01407 Btu(IT)/(h ft °F) Thermal growth coefficient at 0°C and also 1 bara: 0.00369 1/K = 0.00205 1/°F

Follow the links below to get values because that the listed properties that air at varying pressure and also temperature:

See also more about atmospheric pressure, and also STP - conventional Temperature and also Pressure & NTP - typical Temperature and also Pressure,as well as Thermophysical properties of: Acetone, Acetylene, Ammonia, Argon, Benzene, Butane, Carbon dioxide, Carbon monoxide, Ethane, Ethanol, Ethylene, Helium, Hydrogen, Hydrogen sulfide, Methane, Methanol, Nitrogen, Oxygen, Pentane, Propane, Toluene, Water and also Heavy water, D2O.

Air is a mixture of gases at typical conditions. However, at short temperature and high pressure the gas mixture becomes a liquid. The phase diagram for air mirrors the phase habits with transforms in temperature and also pressure. The curve between the triple allude and the vital point mirrors the air boiling point with transforms in pressure.


At the critical point over there is no adjust of state once pressure is raised or if heat is added.

The triple point the a problem is the temperature and pressure at which the 3 phases (gas, liquid, and solid) of the substance coexist in thermodynamic equilibrium.


Download and print air - density vs. Temperature Chart


Download and print air - density vs. Temperature Chart

Example - massive of Air at Temperature 100 oC

From the table above - the density of waiting is 0.946 kg/m3 at 100 oC. The fixed of 10 m3 air have the right to be calculate as

m = V ρ

= (10 m3) (0.946 kg/m3)

= 9.46 kg


m = mass (kg)

V = volume (m3)

ρ = thickness (kg/m3)

Example - massive of Air in ~ Temperature 20 oC

From the table over - thedensity of air is 1.205 kg/m3 in ~ 20 oC. The massive of 10 m3 air have the right to be calculated as

m = (10 m3) (1.205 kg/m3)

= 12.05 kg

Example - Lifting force of a hot Air Balloon

An waiting balloon through volume 10 m3 is heated to 100 oC. The temperature of the surrounding air is 20 oC. The change in gravity force (weight) the the waiting volume is the potential lifting force of the balloon. The lifting force can be calculated as

Fl = dm ag

= V dρ ag

= (10 m3) <(1.205 kg/m3) - (0.946 kg/m3)> (9.81 m/s2)

= 25.4 N


Fl = lifting force - readjust in gravity force (weight) (N)

ag =acceleration of gravity (9.81 m/s2)

dm = Vdρ = adjust of massive in the balloon (kg)

dρ = readjust in thickness due to temperature difference (kg/m3)

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Engineering ToolBox, (2003). Waiting - Thermophysical Properties. available at: .

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