you use the water displacement test. the mass of the displaced water is equal to the mass of the object. because the density of water is one, this means that the volume of the water is equal to the mass of the object
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That is only true if the body floats. Two blocks of different metals, but of the same size will displace the same volume of water. Their masses will not be the same.
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Find the density and mass of the object d=m/v and plug in your numbers and solve for volume
First 'weigh" the ojbect on a scale. this gives the mass. 2nd use the water displacement method to find the volume. Then divide Density = mass / volume.
Large mass
water displacement
If you push it down, you can measure the volume of the displaced liquid.