Correct option is (3) Energy
- Energy is the ability to do work.
- Heat is produced due to vibrations of molecules, collision, and friction of bodies.
- Using heat, we can do work. The Carnot engine is the perfect application of heat.
- When the molecules vibrate, their kinetic energy is converted into heat energy.
- The presence of heat makes a body warmer, and its absence makes it cooler.
- Heat flow in the direction of higher to a lower temperature.
