Heat and Mass Transfer
The expression Q = ρ AT4 is called

Stefan-Boltzmann equation
Fourier equation
Newton Reichmann equation
Joseph-Stefan equation

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Heat and Mass Transfer
A steam pipe is to be insulated by two insulating materials put over each other. For best results

Inferior insulation should be put over pipe and better one over it
Whether to put inferior OIL over pipe or the better one would depend on steam temperature
Better insulation should be put over pipe and better one over it
Both may be put in any order

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