Make a list of the different kinds of energy and then what each kind can be converted to. We think of energy in many different ways. You need energy to go to school, play soccer, or carry groceries. People need energy to drive cars and cook food. But whatever you think of when you think of energy, it is really just the ability to do work.
Energy can change from one form to another.
The unburned fuel has chemical potential energy. The thermal energy is absorbed by the liquid molecules in the heated water, exciting them enough so they can break away from the liquid pool. After breaking away, they shoot into the space above the liquid. The fast-moving vapor molecules can hit objects hard and often, causing a lot of pressure against whatever they hit. This pressure can be used to do work such as pushing on the blades of a turbine , or pushing on the base of a piston .