2014 · Q68
According to the principle of energy conservation, when a piston in an automobile engine compresses the gas in a cylinder, which of the following must occur?
general-sciencephysics
- AKinetic energy of gas must increase
- BThe gas must undergo a change of state.
- CThe gas must undergo a chemical change
- DNone of the above
Explanation
Compressing the gas does work on it, raising the kinetic energy (temperature) of the gas molecules.