Linked from
The 18 pages that link to Maxwell–Boltzmann distribution, each with the reason it gives.
Ideal gasRelated: It describes the range of molecular speeds behind gas pressure and temperature.
Molecular beamRelated: It predicts the speed spread of molecules emerging from a thermal source.
Gas constantRelated: In its molar-energy form, R sets the distribution’s temperature scale.
Number densityRelated: Its velocity distribution is normalized using the gas's number density.