Answer: Root mean square velocity (RMS value)is the square root of the mean of squares of the velocity of individual gas molecules. \(\begin{array}{l}v_{rms}= \sqrt{\frac{3RT}{M}}\end{array} \) Where vrms= Root-mean-square velocity M = Molar mass of the gas (Kg/mole) R= Molar gas constant T = Temperature in Kelvin. Average velocity is the arithmetic mean of the velocities of different molecules of a gas at a given temperature. \(\begin{array}{l}v_{av}= \sqrt{\frac{8RT}{\pi M}}\end{array} \) Where R = Gas constant T = Temperature (in K) M = Molar mass of the gas Refer more
Answer VerifiedRMS velocity is used in place of average velocity because typical gas molecules move in all directions and have net zero velocity. |