The Great Buoyancy Scam: And How to Avoid It by John Kean

Author:John Kean
Language: eng
Format: mobi
Published: 2015-01-28T16:00:00+00:00

Take a few minutes with it and if you’re on a diving course then don’t let anyone short-cut this important procedure.

Ten

Hover, hover, hover

By now we well understand that water is much heavier than air. Find a plastic water bottle full of water and have a look at it. There is probably an inch of air at the top where the bottle isn’t quite full. Now turn the bottle sideways and watch that piece of air spread out along the side of the bottle in little bubbles. Next, point the bottle top towards the floor so that the bottle is now upside down. The air, of course, has now risen to the flat end of the plastic bottle. In other words no matter where you point or position that bottle the air will always rise to the highest point because when in contact with water it is the lightest of the two substances and always floats upwards. (That’s why divers exhaled air works its way to the surface in long trails of silvery bubbles.)

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