Dave wrote:
On Fri, 24 Feb 2006 01:51:49 GMT, Gary said:


Yes. Going from 1 atmosphere to 2 is doubling the pressure. Going from 2 to
3 is increasing the pressure by just half.

1 atmosphere = 14.7 psi
2 atmospheres = 29.4 psi
3 atmospheres = 44.1 psi

The pressure increase is exactly the same for every atmosphere of depth.


Proving my point. 29.4 psi=200% of 14.7 psi. 44.2 psi=150% of 29.4 psi. When
we're talking the effect of pressure increases in the ear drum, it's the
percentage increase that's significant, not the absolute increase. Going
from the surface to 10' you'll notice a big increase. Going from 150' to
160' you probably wouldn't even detect the difference.
Point taken. The perception of changes in pressure is less at great
depths but the pressure change is the same.