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It is defined as the arithmetic mean of the velocities possessed by the different molecules of a gas at a particular temperature.
It is usually represented by \(\nu\).
If all the molecules of the gas are supposed to have different velocities, say \({ \nu }_{ 1 }, { \nu }_{ 2 }, { \nu }_{ 3 },,,, { \nu }_{ n } \) cm/sec, then $$ \nu = \frac { { \nu }_{ 1 }+{ \nu }_{ 2 }+{ \nu }_{ 3 }+,,,,+{ \nu }_{ n } }{ n } $$ $$ \nu = \sqrt { \frac { 8RT }{ \pi M } } $$ where R is Gas constant,
T is absolute temperature
M is molecular Weight of gas.
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