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I am really curious to know how does a piston ring seals inside the cylinder and create such an airtight, explosion proof sealing whereas both rings and cylinder is made of metal. There must be something in between that I am missing. Appreciate if someone can kill this curiosity. Lately watched a nice video of how engine works and ended up with this puzzling thought.

All the rings are metal. If they were made of rubber, they would simply melt as soon as the engine was started. There's a lot of heat inside the cylinder. Lucky for you I'm currently working on an engine with a piston ring problem so I can show you a pic. The engine was overheated and the rings stuck inside the grooves on the piston so they weren't pushing against the cylinder wall and creating a seal. This resulted in the engine losing compression and not starting unless oil was put into the cylinder. You can see from left to right, primary ring, secondary ring and oil ring. You will also notice that the oil ring is grooved to let it carry oil around the base of the piston.

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