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 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.