Question

which series represents the flow of thermal energy in a heat engine? fuel → air inside piston chamber → air outside piston chamber fuel → air inside piston chamber → piston movement fuel → piston movement fuel → air outside piston chamber

Explanation:

In a heat engine, fuel is burned in the air inside the piston chamber. The thermal energy from the combustion causes the air to expand, which then leads to piston movement. The first option is incorrect as the flow is not just to the outside air. The third option skips the air - inside - piston - chamber step. The fourth option is also incorrect as it skips the necessary internal steps.

Answer:

Fuel → air inside piston chamber → piston movement