Question: A formula for estimating the mean free path of a perfect gas is: = 1.26 /pR|T) = 1.26 /p (RT) Where the latter form follows

A formula for estimating the mean free path of a perfect gas is: ℓ = 1.26 μ/p√R|T) = 1.26 μ/p √ (RT) Where the latter form follows from the ideal-gas law, ρ = p/RT. What are the dimensions of the constant “1.26”? Estimate the mean free path of air at 20°C and 7 kPa. Is air rarefied at this condition?

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