"Not sure why you can't simply say " for the example you gave you would be correct""
Yes - but that's not what is being discussed. Let me try and express it more simply.
If I buy two identical 2 litre PET bottles of Sainsbury's Basic Lemonade, then empty them so that they are both half-full. On one, I allow the bottle to flip out to its original shape and screw the cap on; for the other, I squeeze out the gas to make the volume above the liquid smaller - then I screw the cap on.
Question - in which bottle will the remaining lemonade go flattest first?
No champagne bottles, no semi-rigid Coke bottles, no other red herrings.
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