Breaking into a car is generally a bad idea. That said, it could potentially be necessary to gain access to your own vehicle in an emergency, and it's actually much harder than you might think since most modern cars use tempered glass, which is much harder to crack. Still, it is possible... if you know the tricks.
We all learn the theory of what happens inside an internal combustion engine; a mixture of fuel and air is ignited by a short electric spark. Some people describe the ensuing event as an explosion, but the ideal is a controlled burn, but it's still so fast that it could be confused for an uncontrolled explosion. An engine is a practical application of thermodynamics, when it comes right down to it. The piston moves by the pressure exerted by the burning fuel mixture, and as the piston moves down