Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Do not move actually
Does not affect the intervening medium
Move actually
Affect the intervening medium

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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

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

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