> 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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