The Prandtl number is a dimensionless number that gives the ratio of momentum diffusivity to thermal diffusivity in a problem where there is coupled thermal and momentum transfer. The Prandtl number appears frequently in problems that have a fluid in transport with a temperature difference.

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This timeline is meant to help you better understand what the Prandtl number is:
0:00 Introduction.
0:10 What is the Prandtl Number?
1:52 Prandtl Number Example.
4:09 Common Prandtl Number Ranges.
4:45 Outro

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This video is part of our Transport Phenomena course. Transport phenomena is a key engineering science. Within this Transport Phenomena course we will be discussing transport of momentum, mass and energy between various systems.