[arachne] Re: Best tip of the year

Arachne at FreeLists---The Arachne Fan Club!

On Sat, 5 Nov 2005 15:29:24 -0700 (MST), Steve wrote:

> On Sat, 5 Nov 2005, L.D. Best wrote:

>> No stem-wound wrist watch small enough to wear in
>> public could ever be truly water proof even at only
>> 30' depth (2 atmosphere's pressure at that level).

> You're on a roll. First the verb/vowel thing, and now
> the atm/feet of water thing.

> (1 atm = approx. 32' water)

Yes.......... 1 _additional_ ATM/32'

At sea level... we are at 1 ATM pressure.

At 32' ... we are at 2 ATMs pressure.

At 64' ... 3 ATMs

At 96' ... 4 ATMs


http://newport.pmel.noaa.gov/nemo1999/logbook/cal071199/

When I stand out on deck, the air above me is pushing down
with a force equal to one atmosphere of pressure. I don't
even notice it. In fact, we all take it for granted. Imagine that I
jump in (boy this water is cold) and swim downward, I feel the
pressure in my ears. The rest of my body does not register
this small amount of pressure increase. If I went deeper, say
1500 m down, any part of my body that contained air would
collapse and be flattened. Not a pleasant thought. As you
increase the depth of your dive, the pressure is a cumulative
factor. For each 10 m (32 feet), you add one more
atmosphere (atm). At 1500 m, where we are diving, the
pressure is roughly 150 atm or just over 2200 lb. per square
inch. This is one reason we use ROPOS to do our bidding at
the bottom. Even it sometimes suffers from the extreme
pressure below. All of the equipment on ROPOS has to be
specially designed to operate in this high pressure
environment. 


-- 
 Glenn
 http://www.delorie.com/listserv/mime/
 http://www.cisnet.com/glennmcc/
 http://www.law.cornell.edu/constitution/constitution.table.html

Arachne at FreeLists
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