Any heat engine has three main elements: a working fluid, a heater, and a refrigerator. What is in an internal combustion engine: a) a working fluid that performs work; b) a heater that imparts energy to the working fluid; c) a refrigerator that absorbs part of the energy from the working fluid?
a) the working medium of the internal combustion engine is gas; b) the heater is a burning gas-fuel mixture, c) the refrigerator is the atmosphere.
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