Heat and Mass Transfer
Film coefficient is defined as Inside diameter of tube

Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity
Film coefficient × Inside diameter Thermal conductivity
Equivalent thickness of film
Thermal conductivity Equivalent thickness of film Specific heat × Viscosity

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Heat and Mass Transfer
Kirchhoff's law states that

The total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
None of these
The wave length corresponding to the maximum energy is proportional to the absolute temperature

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