2nd October 2019

libretexts
10

What is most probable speed?

Figure 1 shows the Maxwell-Boltzmann distribution of speeds for a certain gas at a certain temperature, such as nitrogen at 298 K. The speed at the top of the curve is called the most probable speed because the largest number of molecules have that speed.

What is r in root mean square velocity?

It is defined as the square root of the average velocity-squared of the molecules in a gas. It is given by the formula. where vrms is the root mean square of the speed in meters per second, Mm is the molar mass of the gas in kilograms per mole, R is the molar gas constant, and T is the temperature in kelvins.
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