If you know the volume, you know how much stuff it can hold and how much space it takes up.
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Density=Mass/Volume You need also to know the volume !
volume of a cube is length, by width by height. To calculate the volume of a cylinder you need to know the radius and the height and multiply.
You wll also need to know its radius as well as its volume
It depends on what information you have. You need to know the mass of something and the force of gravity at the location where you want its weight. If you do not know the mass, you need to know the density and volume. Archimedes's method is not appropriate because that derives the weight by experiment rather than mathematical formula. If you do not have the volume, you need to know those dimensions of the object that will allow you to calculate the volume.
You can't. You need to know content.