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    The volume of body, having an irregular shape, is to be determined . In sea water it has an apparent mass of 151.9 kg, but in air the mass is 244.9 kg.
    calculate the density of this object.
    Take density of sea water as 1025 and the gravitational acceleration as 9.81 m/s^2.

    The difference in weight is due to the upthrust in water. Find the difference in weight first so that you know what the upthrust is.

    The upthrust is also equal to the weight of water displaced. So now you also know the weight of water displaced, you can calculate the volume of that water which, of course, is the same as the volume of the object.
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Updated: March 9, 2018
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