What are the dimensions of the constant 1.26? Use the for- mula to estimate the mean free path of air at 20°C and 7 kPa. Would you consider air rarefied at this condition? Henri Darcy, a French engineer, proposed that the pressure drop Ap for flow at velocity V through a tube of length L could be correlated in the form AP - a LV If Darcy's formulation is consistent, what are the dimen- sions of the coefficient a?

What are the dimensions of the constant 1.26? Use the for- mula to estimate the mean free path of air at 20°C and 7 kPa. Would you consider air rarefied at this condition? Henri Darcy, a French engineer, proposed that the pressure drop Ap for flow at velocity V through a tube of length L could be correlated in the form AP - a LV If Darcy's formulation is consistent, what are the dimen- sions of the coefficient a?