Air Properties

Density, specific heat, thermal conductivity, expansion coefficient, kinematic viscosity and Prandtl's number - air temperature ranging -150 oC to 400 oC

Air density, specific heat, thermal conductivity, kinematic viscosity, expansion coefficient and Prandtl's number - temperatures ranging -150 oC to 400 oC.

Temperature
- t -
(oC)
Density
- ρ -
(kg/m3)
Specific Heat
- cp -
(kJ/(kg K))
Thermal Conductivity
- k -
(W/(m K))
Kinematic Viscosity
- ν -
x 10-6 (m2/s)
Expansion Coefficient
- b -
x 10-3 (1/K)
Prandtl's Number
- Pr -
-150 2.793 1.026 0.0116 3.08 8.21 0.76
-100 1.980 1.009 0.0160 5.95 5.82 0.74
-50 1.534 1.005 0.0204 9.55 4.51 0.725
0 1.293 1.005 0.0243 13.30 3.67 0.715
20 1.205 1.005 0.0257 15.11 3.43 0.713
40 1.127 1.005 0.0271 16.97 3.20 0.711
60 1.067 1.009 0.0285 18.90 3.00 0.709
80 1.000 1.009 0.0299 20.94 2.83 0.708
100 0.946 1.009 0.0314 23.06 2.68 0.703
120 0.898 1.013 0.0328 25.23 2.55 0.70
140 0.854 1.013 0.0343 27.55 2.43 0.695
160 0.815 1.017 0.0358 29.85 2.32 0.69
180 0.779 1.022 0.0372 32.29 2.21 0.69
200 0.746 1.026 0.0386 34.63 2.11 0.685
250 0.675 1.034 0.0421 41.17 1.91 0.68
300 0.616 1.047 0.0454 47.85 1.75 0.68
350 0.566 1.055 0.0485 55.05 1.61 0.68
400 0.524 1.068 0.0515 62.53 1.49 0.68

Example - Mass of Air at 100 oC

From the table above - the density of air is 0.946 kg/m3 at 100 oC. The mass of 10 m3 air can be calculated as

m = V ρ

= (10 m3) (0.946 kg/m3)

= 9.46 kg

where

m = mass (kg)

V = volume (m3)

ρ = density (kg/m3)

Example - Mass of Air at 20 oC

From the table above - the density of air is 1.205 kg/m3 at 20 oC. The mass of 10 m3 air can be calculated as

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

= 12.05 kg

Example - Hot Air Balloon

An air balloon with 10 m3 is heated from 20 oC to 100 oC. The change in gravity force (weigh) is the potential lifting force from the hot air balloon and can be calculated as

Fl = dm ag

= ((12.05 kg) - (9.46 kg)) (9.81 m/s2)

= 25.4 N

where

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

dm = change of mass in the balloon (kg)

agacceleration of gravity (9.81 m/s2)

Related Topics

• Environment - Climate, meteorology, sun, wind and environmental resources
• Air Psychrometrics - The study of moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content
• Basics - The SI-system, unit converters, physical constants, drawing scales and more
• 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
• Density - Density of different solid materials, liquids and gases. Definitions and convertion calculators.
• Viscosity - Documents giving viscosity of different kind of chemical species at varying conditions

Tag Search

• en: air properties temperature viscosity
• de: Luft Eigenschaften Temperatur-Viskosität

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