Give examples of heat engines you know. What transformations of energy take place in them? Why can’t the efficiency

Give examples of heat engines you know. What transformations of energy take place in them? Why can’t the efficiency of a heat engine be 100%?

A heat engine is a device in which the internal energy of the fuel is partially converted into mechanical energy. Heat engines include a steam turbine, a jet engine, an internal combustion engine.
The amount of heat released during fuel combustion is not completely converted into mechanical energy, since a significant amount of heat is transferred to the environment (heat loss), so the efficiency is not 100%.

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