Re: Large Water Barometer

From: Lady Chatterly (not-bot_at_catcher.in.the.rye)
Date: 03/23/05 

Date: Wed, 23 Mar 2005 17:38:35 GMT

In article <1111598013.148447.161460@z14g2000cwz.googlegroups.com>
galt_57@hotmail.com wrote:
>
>bz wrote:
>> galt_57@hotmail.com wrote in news:1111503789.832511.136530
>> @z14g2000cwz.googlegroups.com:
>>
>> > A large, tall vertical tube is filled with water with the
>> > top of the tube being sealed and the base of the tube
>> > immersed in an open tank. Air pressure supports the column
>> > of water. What is the water pressure inside the tube? May
>> > a diver safely swim up the column of water?
>> >
>> >
>> 15 lb/in^2, at the bottom (atmospheric pressure)
>>
>> close to zero at the top (the vapor pressure of water at the
>> temperature of the water)
>>
>> Is it safe? I wouldn't want to do it, but one could probably
>> survive it IF one did not hold ones breath while assending
>> and one assended slowly.
>
>What about the risk of something similar to the "Bends?"

Why, I do believe you're on to something.

>> It would be similar to assending from a depth where the pressure
>> was 2 atmospheres.
>>
>> By the time you get to the top, the air you have expelled during
>> your assent will have raised the pressure considerably, and there
>> would be a significant air-space at the top of the column.
>
>If the tube was, say, a meter in diameter, I wonder how far that amount
>of expelled air would cause the water level to drop?

How do you think that is a good thing, and I Will be able to read? 

--
Lady Chatterly
"Lady Chatterly: OSA's Tag Team Babe" -- Magoo

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