The problem is solved by calculating the vector sum of forces for the vertical axis.
mg-pgV = P
That is, you need to know your volume
the volume can be found if you know the cross-sectional area, for example, of a pool, and by measuring the change in water level.
then V = S * (H-h), where S is the area of the pool in square meters, H is the final water level in meters, h is the initial water level in meters
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