Question

definition of heat engine

Answer 1

In thermodynamics and engineering, a heat engine is a system that converts heat or thermal energy—and chemical energy—to mechanical energy, which can then be used to do mechanical work. The mechanical work often involves powering a generator which converts the mechanical energy to electrical energy

Answer 2

a heat engine is a system that converts heat or thermal energy and chemical energy to mechanical energy, which can then be used to do mechanical work