Answer :
Final answer:
Internal combustion piston engines convert heat from burning fuel into mechanical energy to power the vehicle through a series of cycles.
Explanation:
Internal combustion piston engine functions not only by burning gas to generate heat but also by utilizing the high-pressure gas produced to exert force on a movable piston, which leads to mechanical work through the engine's cycle. The gas expanding due to combustion creates pressure that moves the piston, linked to a crankshaft, converting thermal energy into mechanical energy to propel the vehicle.
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