claim: “Temperature, like viscosity and density, and of course phone numbers, is not something that can be meaningfully averaged. ‘
evidence: An elementary calculation for a dilute gas at temperature T { \displaystyle T } and density ρ { \displaystyle 
  ho  } gives μ = α ρ λ 2 k B T π m , { \displaystyle \mu =lpha 
  ho \lambda { \sqrt { rac { 2k { 	ext{ B } }T }{ \pi m } } }, } where k B { \displaystyle k { 	ext{ B } } } is the Boltzmann constant, m { \displaystyle m } the molecular mass, and α { \displaystyle lpha  } a numerical constant on the order of 1 { \displaystyle 1 } .