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You can use either your eyes, calculate the volume or practically pour liquids in a given container to find out which one has a bigger volume.
The two ways are:empirical: measure ittheoretical: calculate it (using formulae).
find buoyancy and the height depth and with and you've got your answer
Yes, V=(l)(w)(h) :) That is how volume would be calculated for a rectangular object. Of course, not all objects are rectangular. There is a different formula for a sphere, for example (4/3 pi r cubed). And even irregularly shaped objects still have a volume; it is not as easy to analyse mathematically, although there are ways of measuring it (typically by immersion in a graduated cylinder).
v=s.h where h:height and s:surfacev=m/d where m:mass and d:density