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Orchid XP v8 wrote:
>> Even the $25 pump gets you down to 29" of vacuum.
>
> Interesting. I wonder what it costs to buy a large container than can
> withstand several thousand Newtons of force trying to crush it...
Really, not all that much. You're really only talking about one atmosphere.
A soda can will keep that much *in*.
--
Darren New, San Diego CA, USA (PST)
Forget "focus follows mouse." When do
I get "focus follows gaze"?
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>>> Even the $25 pump gets you down to 29" of vacuum.
>>
>> Interesting. I wonder what it costs to buy a large container than can
>> withstand several thousand Newtons of force trying to crush it...
>
> Really, not all that much. You're really only talking about one
> atmosphere. A soda can will keep that much *in*.
Hmm, 1 atmosphere. That's about 100 kPa. Over a 100 cm^2 area, that's
about 1,000 N. Sounds like a pretty big force to me...
Then again, I was under the impression that a soda can only holds about
0.01 atm of pressure. (1 atm is a LARGE pressure, after all.)
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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Orchid XP v8 wrote:
> (1 atm is a LARGE pressure, after all.)
No, it's really not. Your car tires hold twice that in a safety-critical
application. A scuba tank easily holds 200 times that much. How much
pressure do you think is on the glass of a huge aquarium (like in an
aquarium museum type building)? Submarines? It's not really that tough to
hold out dozens of atmospheres, let alone one.
--
Darren New, San Diego CA, USA (PST)
Forget "focus follows mouse." When do
I get "focus follows gaze"?
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> Hmm, 1 atmosphere. That's about 100 kPa. Over a 100 cm^2 area, that's
> about 1,000 N. Sounds like a pretty big force to me...
Most standard drinks bottles seem to be able to take about 10 atmospheres
pressure:
http://home.people.net.au/~aircommand/procedures.htm
Your mains water pressure is probably around 5 atmospheres.
You really don't need very thick walls to enclose 1 atmosphere safely.
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On Mon, 18 Jan 2010 08:58:04 +0100, scott wrote:
> Most standard drinks bottles seem to be able to take about 10
> atmospheres pressure:
Interestingly, I was watching Mythbusters last night; one of the myths
they were testing was a "water rocket" myth that involved 3L soda bottles.
They pumped them up to around 90 PSI before they had critical failures.
That's about 400 N per square inch....And that's a soda bottle. :-)
Jim
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