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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
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For water in STP:
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See also
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Physics / Thermodynamics / Heat Transfer
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