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It is dynamic property of the substance at a given pressure and temperature: 

LaTeX Math Inline
body--uriencoded--%7B\rm Pr%7D = %7B\rm Pr%7D(p, T)
.

High values mean that heat convection dominates heat conduction.

For most gases over a wide range of temperature and pressure,
 Prandtl number is approximately constant at around
LaTeX Math Inline
body--uriencoded--%7B\rm Pr%7D(p, T) = 0.71
.

For water in 
:  
LaTeX Math Inline
body--uriencoded--%7B\rm Pr%7D = 7.56
.


Material

Prandtl number  

Conditions
Air0.71STP
Oxygen0.63STP
Most gases
Natural gas0.
6 ÷
70 ÷ 0.
8
72wide range of 
Temperature
temperature and 
Pressure
pressure
Water7.56STP
Light oil600STP


See also

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Physics / Thermodynamics Heat Transfer

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