Heat and Mass Transfer
The heat transfer takes place according to

Zeroth law of thermodynamics
Second law of thermodynamics
First law of thermodynamics
Kirchhoff's law

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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
Both may be put in any order
Better insulation should be put over pipe and better one over it

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