Ans
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See in the initial state the part above the piston is COMPLETELY EVACUATED...And clearly notice the thing said by sir in this video.....see when u move the piston u might imagine that gas might expand... But, THINK how it expands...So for that initially the vaccum space is created and the gas particles fill in that space.. So, that's why there is an expansion in the volume as well as decrease in the density of the gas.....
2 years ago
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