The educational resource shows an interactive animation about the internal combustion engine: in real combustion engines, the energy is extracted from the combustion of some type of fuel, which has been injected into a cylinder, finely pulverised and mixed with oxygen. Then the combustible mixture is compressed and ignited to explode. That is why these engines are known as combustion engines.

The educational resource shows an interactive animation about Joule´s experiment: the mechanical energy of a mass falling from a certain height can be transformed into an increase in temperature inside a liquid.

The educational resource shows an interactive animation about the Carnot's engine: it is a theoretical model, not a real one, but we can already see in it the fundamental characteristics of real heat engines.The system is based on the phenomena of the expansion and contraction of gases through heat gain and loss.

In this educational resource you can check the next physical phenomenon: when there is a change of state in pure substances, the temperature remains constant.

The educational resource shows an interactive animation about changes in water: the change from a solid to a liquid is called fusion. The change from a liquid to a gas is called evaporation. When water boils it is called ebullition.

The educational resource shows an interactive animation about the change of phase: solids melt when they are heated and liquids evaporate, changing to a gaseous state. If you increase the vibration of the molecules you can see how water changes phase.