Fluid Mechanics
Fluid Mechanics
8th Edition
ISBN: 9780073398273
Author: Frank M. White
Publisher: McGraw-Hill Education
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Chapter 1, Problem 1.5P

The mean free path of a gas, l, is defined as the average distance traveled by molecules between collisions. A proposed formula for estimating t of an ideal gas is

l = 1.26 μ ρ R T

What are the dimensions of the constant 1.26? Use the formula to estimate the mean free path of air at 20°C and 7 kPa. Would you consider air rarefied at this condition?

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A gas at 20°C may be considered rarefied, deviating from the continuum concept, when it contains less than 101 molecules per cubic millimeter. If Avogadro's number is 6.029 E23 molecules per mole, what absolute pressure (in Pa) for air does this represent?
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Chapter 1 Solutions

Fluid Mechanics

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