Three closed vessels A, B and C at the same temperature T and contain gases which obey the Maxwellian distribution of velocities. Vessel A contains only $O_2$, B only N$_2$ and C a mixture of equal quantities of $O_2$ and N$_2$. If the average speed of the 0 2 molecules in vessel A is $v_1$,, that of the N$_2$ molecules in vessel B is v$_2$, the average speed of the $O_2$ molecules in vessel C is
where, M is the mass of an oxygen molecule