Humor me. show me a link to a claim that the water displaced by an immersed human body measures weight, mass and body fat.
I'm willing to accept the possibility that body fat can be estimated by comparing weight (measured independently) and body volume. But that isn't what you are claiming.
I would like to see a reference to a procedure that measures the weight of a human body by displacing water.
By the way, do you claim that gravity cannot be directly detected?
I don't think you have any idea, one way or another, much less any idea what I'm claiming or not claiming at this point. Maybe you should re-read my post!
YOU are saying it's not the case, it's your burden of proof, not mine.
DU?
MoveON?
Humor US!
Displacement is denoted in measures of weight... ships are rated according to the weight of water they displace... which equals the weight of the ship at any given time. If you measure the amount of water a human body displaces when floating, you can easily calculate the weight. Fresh water weighs 8.35 lbs per US Gallon. Measure the volume of the water poured off a completely filled container after you place a human body into the the container, multiply the fractional gallon measurement by 8.35 Lbs and you will have an accurate measure of the weight of the body.
Force the body to submerge and then measure that outflow... that will give you data on the volume the body, apply known ratios and you can calculate the mass of muscle, fat, and bone. Those calculations are not as accurate as the first displacement method of finding weight... but they are sufficiently accurate for most purposes.