I have always found it interesting--as a certified SCUBA diver--that according to someone's law of pressure (Boyle? Dalton? Kilroy's? Someone else?), pressure on the body underwater doubles at 33 feet. That's 10 m, of course. That is, at 10 m there is 2x atmospheric pressure, and that there is 3x at 20 m, etc.
I have always wondered just why this is. Why at 10 m, and not, say, 11.5, or something else? Anyone know? Just a coincidence?
HARRY WYETH
