Ernie S.
Diamond Member
Water displacement is the only way I can think of.
^^^^^ That.
If you fill a bucket with water (or, in Radio's case, beer) and weigh it, then stick your head in it, and weigh it again... that gives you the weight of your head. I did not know that till today.
only if your head is the same density as water... or beer.
Let's say we make 2 exact models of your head one from styrofoam amd one from iron. They will both displace the same volume of water, but weigh nowhere near the same.