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2. Calculating the thermal conductivity of gases
The kinetic theory of gases assumes that all molecules are non-interacting rigid spheres of mass m and diameter σ moving at an average velocity v. The number of molecules per unit volume is n. Under the influence of a temperature gradient, the molecules move, collide and bring a certain amount of energy into play. This energy flow q
z
between two gas layers is proportional to the energy density :
with :
- c V :
-
constant-volume heat capacity per molecule
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Calculating the thermal conductivity of gases
Thermal conductivity of liquids
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