You can find the mass of an object by weighing it in a known gravity field, and then converting between Newtons and KiloGrams. On the Earth, the "normal" gravity field is 9.81 m/s2, and it is common to express mass and weight as the same thing although, technically, it is not.
In a zero-g environment, such as in space orbit, you can determine mass by suspending the object between two calibrated springs and bouncing them. You would measure the displacement and period of oscillation, and you would need to know the force of the springs as a function of displacement.
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Large mass
To find the volume of an object use the formula v=dm where Volume=Density x Mass To find the mass of an object use the formula m=dv where Mass=Density x Volume
mass divided by volume
No mass divided by volume
The law of conservation of mass states mass= density times volumeThe definition of density=mass/volumemultiply the density and the volume! =mass