Emily Smirle wrote:
There's a problem with assuming that "people float, therefore their
density must be 1.0-ish".
People *FLOAT*, therefore they are less dense than water.
People just barely float, and if you exhale, you can drop to neutral
density or even sink. Therefore, overall density must in fact be close to 1.
All the numbers I have suggest that humans have a density roughly around
0.75 kg/liter or 47 lbs/cu. fo. and this certainly seems consistent with
observed behavior, along with being comfortably in the "denser than many
types of wood, but less dense than notoriously dense woods" range.
Okay, some quick checking on the internet gives me a muscle density of
1.06, a fat density of 0.9, and a lung volume of around 6L. I was unable
to find particularly accurate numbers for the density of bone, but it
appears to be in the vicinity of 2, and thus roughly offsets the effects
of lung volume.
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