Most Probable Speed
The particle speed corresponding to the maximum peak of the Maxwell-Boltzmann speed distribution curve.
Governing formula
v_mp = √(2 kB T / m) = √(2 R T / M)
SI unit
m/s
In depth
Represents the speed possessed by the largest number of particles in a gas. Note $v_{mp} < v_{avg} < v_{rms}$ ($1 : 1.128 : 1.225$).
Examples in the real world
Most probable speed of Nitrogen ($N_2$) molecules in air at 300 K being approximately $422 m/s$.