To strictly address the weight of an object in a fluid, one needs to know 2 things - the weight of the fluid (fresh water is 8.33 #/gal) and the objects' weight in air. Each fluid weight has a buoyancy factor where BF = 1 - (fluid wt/ gl divided by 65.42). Multiply the object weight in air by the BF and you will have the weight of that object in that particular fluid. The buoyancy factor for fresh water is .8727.
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