Question

In an internal combustion engine, heat flow into a gas causes it to....?

contract
expand

Answer 1

In an internal combustion engine, heat flow into a gas causes it to expand.

The application of direct force to specific parts of the engine will produce expansion of the high-temperature and high-pressure gases. Which will transform the chemical energy from the fuel (such as gasoline or oil) into mechanical energy.

Answer 2

expand is the answer hope i helped