eli5: When air gets heated, it’s volume increases. How does the surrounding air make room for the increased volume?
In: Physics
It expands if it has room to expand which means that something else has to move. If it is in a cylinder with a piston then the piston moves producing work (an engine). If it is surrounded by other air then that air will move away. If it is in a balloon then the wall will stretch and the balloon will get bigger. If it is in a pressure proof cylinder with a fixed shape then it will not expand and the pressure will go up instead.
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