Lesson: Mean Free Path of Gas Molecules
In this lesson, we will learn how to calculate the mean free path of a particle in an ideal gas given the pressure and temperature of the gas.
Sample Question Videos
Worksheet: 4 Questions • 1 Video
The mean free path for methane at a temperature of 273 K and a pressure of Pa is m. Find the effective radius of the methane molecule.
For the equations of hydrodynamics to apply to a highly compressible fluid, the mean free path must be much less than the linear size of a volume , where is a small volume of fluid. For air in the stratosphere at a temperature of 220 K and a pressure of 5.8 kPa, determine the value of that is 100 times greater than the mean free path of molecules in the air. Use a value of m as the effective radius of the molecules in air.
What is the density of helium under these conditions in molecules per cubic meter?
What is the density of helium under these conditions in moles per cubic meter?