化工英语翻译（之一），非常急！！！谢谢！！！

Heat, as a form of energy, cannot be created or destroyed. Heat can be transferred
from one substance to another.
Heat always tends to pass from warmer objects to cooler ones. When a warm substance
comes in contact with a cold substance, the molecules of the warm substance collide with the
molecules of tbe cold substance, giving some of its energy to the cold molecules. This is on
ly one way to transfer beat.
In a chemical plant, for example, in a refinery, transfer of heat is very important.
The successful operation of most processes is dependent on correct application of the princi
ples of heat transfer. Where we are handling a hot material, we may insulate the system to
hold the heat in; where the material is cold, we may insulate to keep the heat out. Effleient
equipment, designed to take full advantage of processing heat, is in use in almost all ehemi
cai plants.
Three methods of heat transfer

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