Methane  Prandtl number vs. Temperature
Figures and table showing changes in Prandtl number for methane with changes in temperature and pressure.
The Prandtl Number  Pr  is a dimensionless number approximating the ratio of momentum diffusivity (kinematic viscosity) to thermal diffusivity  and is often used in heat transfer and free and forced convection calculations.
The Prandtl number can for calculations be expressed as
Pr = μ C _{ p } / k (1)
where
μ = absolute or dynamic viscosity (kg/m s, lb _{ m } /(ft h))
C _{ p } = specific heat (J/kg K, Btu/(lb _{ m } ^{ o } F))
k = thermal conductivity (W/m K, Btu/(h ft ^{ 2 } ^{ o } F/ft))
Below, Prandtl numbers for methane at varying temperatures and pressures are given in figures and table .
See also other properties of Methane at varying temperature and pressure : Density and specific weight , Dynamic and kinematic viscosity , Specific heat (Heat capacity) and Thermal conductivity , and Thermophysical properties at standard conditions , as well as Prandtl number of Air , Ammonia , Carbon dioxide , Nitrogen , Propane and Water .
Methane Prandtl number at atmospheric pressure, temperature given as °C or °F:
Methane Prandtl number at varying temperatures and constant pressures, SI and Imperial units:
Methane Prandtl number at given temperatures and 1, 10 and 100 bara presure:
Temperature 
Prandtl number at given pressures 

[K]  [°C]  [°F]  1 bara, 14.5 psia 
10 bara, 
100 bara, 1450 psia 
160  113  172  0.7721  0.8659  1.629 
180  93.2  136  0.7583  0.8170  1.640 
200  73.2  99.7  0.7487  0.7892  1.867 
220  53.2  63.7  0.7420  0.7726  2.055 
240  33.2  27.7  0.7369  0.7607  1.453 
260  13.2  8.3  0.7328  0.7515  1.148 
280  6.9  44.3  0.7299  0.7452  1.007 
300  26.9  80.3  0.7279  0.7402  0.9304 
320  46.9  116  0.7261  0.7370  0.8824 
340  66.9  152  0.7243  0.7341  0.8501 
360  86.9  188  0.7234  0.7312  0.8269 
400  127  260  0.7216  0.7276  0.7968 
500  227  440  0.7182  0.7233  0.7560 
600  327  620  0.7155  0.7179  0.7385 
700  427  800  0.7127  
800  527  980  0.7099  
900  627  1160  0.7082  
1000  727  1340  0.7060 
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