- Drop 'marbles' of this special substance into the flask. Remove $1\: cm^3$, add a sphere $1.24\:cm$ in diameter. (Might that be combined with measuring? Throw a marble in, a measured amount overflows.)
- Try and construct a sufficiently tight piston, a bit like the comment by AlexP. Basically, the opening is the full diameter of the flask, and you screw it down until it touches the surface. (Problem: how to get the remaining air out?).
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Answer by o.m. for Is it possible to design a bottle that can always be "full"?
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