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Nitrogen in Tyres


Hurtle

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A few figures to contemplate:-

Density@STP: Air 1.293 kg/cu.m N2 1.25kg/cu.m

Spec. heat capacity: Air 993J/kg/K N2 1040J/kg/K

Cp/Cv Air 1.402 N2 1.404

Viscosity Air 18.3E-6 N.s/m2 N2 16.7E-6 N.s/m2

 

One thing to bear in mind regarding water vapour is that air delivered from a cool air reservoir of a garage compressor at typically 150psi is quite dry ( less than 2g/m3 or a dew point of less than -10degC)

 

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