Molecular scale temperature

The molecular-scale temperature is the defining property of the U.S. Standard Atmosphere, 1962. It is defined by the relationship:

T m ( z ) = M 0 M ( z ) ⋅ T ( z ) T_m(z) is molecular-scale temperature at altitude z; M₀ is molecular weight of air at sea level; M(z) is molecular weight of air at altitude z; T(z) is absolute temperature at altitude z.

This is citation of the Technical Report of USAF from 1967.