题目内容

In an automobile engine, heat flows or transfers from the iron or aluminum cylinder to the cooling water, and from the coolant to the copper or aluminum radiator.

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It is constructed to hold a large amount of water in tubes or other passages which provide a large area in contact with the atmosphere.

In operation, the thermostat is designed to close off the flow of water from engine to radiator until the engine has reached the desired operating temperature.

We cannot eliminate internal friction, but we can reduce it to a controllable degree by the use of friction reducing lubricants.

Slow speed, stop-and-go operation means that the engine seldom gets hot enough to drive the water and vapor out of the crankcase.