In 1916 Nusselt derived a theoretical relation for predicting the coefficient of heat tran...

In 1916 Nusselt derived a theoretical relation for predicting the coefficient of heat transfer between a pure saturated vapor and a colder surface:

where h is the mean heat transfer coefficient, Btu/[ (hr) (ft2) (°F) ]

k is the thermal conductivity, Btu/[(hr)(ft)(°F)]

ρ is the density in lb/ft3

g is the acceleration of gravity, 4.17 × 108 ft/(hr)2

λ is the enthalpy change of evaporation in Btu/lb

L is the length of tube in ft

m is the viscosity in lbm/[ (hr) (ft) ]

ΔT is a temperature difference in °F

What are the units of the constant 0.943?