Heat and Mass Transfer
The heat transfer takes place according to

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

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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

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

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