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A heat engine is a device that converts work into heat?

That statement is incorrect.

A heat engine actually does the opposite: it converts heat into work.

Here's why:

* Heat engines work on the principle of a temperature difference: They take in heat from a high-temperature source (like burning fuel) and then expel some of that heat to a low-temperature sink (like the environment).

* The difference in temperature allows for work to be done: The engine uses this temperature difference to drive a process, like expanding gas to turn a turbine, which in turn produces work (like generating electricity).

Think of it this way:

* Heat engine: Like a car engine, it burns fuel (heat) to move the car (do work).

* Work into heat: That's more like friction, where the energy of motion (work) is converted into heat.

Let me know if you'd like to learn more about how heat engines work!