The ratio of the thickness of thermal
boundary layer to the thickness of hydrodynamic boundary layer is equal to 
, where n is ________ .
1
-1
The ratio of kinematic viscosity to
the thermal diffusivity is known as Prandtl number.It is also relate with the
thickness of thermal boundary layer to the thickness of hydrodynamic boundary
layer.
And the relation they show is,
Hence, the correct option is (A).
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