I'm voting with Mr. Mann, so that's 2 to 1.
Your mass and your volume will be the same if your
lung volume is the same (and it's the same day, so
you haven't gained or lost weight!). I think you
could take a deep breath and relax into a
cannonball float quite comfortably. How easy do
you find it to float on your front vs your
Your actual surface area is the same
regardless of your position, since you're not
going to cannonball tightly enough to actually
include or exclude any water or air with your
body, as compared with flat floating. I think
your buoyancy just relates to an amount of water
displaced, based on your mass and volume, so that
shouldn't change. But you can ask Mr. Mann about
that - I know more biology and chemistry than
physics. Based on my experience with floating,
though, I think the sensation feels quite
different for the 3 floats; and this is probably
the reason for your different experiences.
my greetings to Mr. Mann and tell him I think
teaching hi school science is a really valuable
Also - check out 'buoyancy' and 'floating'
and such on www.google.com - I think everyone
floats, but maybe some people have too little fat,
except in their heads, where our brains are full
of fat.And try some simple experiments, too.
There are, of course, clay boats and foil boats,
where you can displace enough water to make heavy
things float, but I don't think that's what's
happening with you.
Let me know if you come
up with any convincing evidence that Mr. Mann and
I are wrong!
Click Here to return to the search form.