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Unformatted text preview: therefore an average speed) the individual molecules move at various speeds • Some are moving fast, others relatively slowly • At higher temperatures at greater fraction of the molecules are moving at higher speeds What is the speed (velocity) of a molecule possessing average kinetic energy? • The average kinetic energy, ε , is related to the root mean square (rms) speed u Example: Suppose we have four molecules in our gas sample. Their speeds are 3.0, 4.5, 5.2 and 8.3 m/s. • The average speed is: • The root mean square speed is: • Because the mass of the molecules does not increase, the rms speed of the molecules must increase with increasing temperature...
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