Molecular Properties of Gases

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Physics Fluid Mechanics and Thermal Physics

	The distribution of molecular energies:
	The distribution of molecular energies depends upon the number of freedoms associated with the molecule. The molecules of matter at ordinary temperatures can be considered to be ceaseless random motion at high speeds. The average translational kinetic energy for any molecule in three dimensions can be For N molecules the average kinetic energy in three dimensions will be: For a diatomic gas, the average kinetic energy in three dimensions will be as above. However, the total internal energy will be When the diatomic molecules are set to vibrations to increase two of degrees of freedom then the expression for the internal energy will be: