Brad wrote:
If you inhale a gas which is heavier than air, what
happens?
Like argon, for instance? Argon is heavier than "air", and for
that matter heavier than O2, N2, and almost as heavy as CO2. The
earth's atmosphere contains about 1% Argon. Since the atmosphere is
about 80km tall, obviously there must not be anything but argon down
here in the bottom 800m for us to breathe. Just like the claim
that a room containing a few percent of halon will have no O2 near
the floor.