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  Andy Hall <mbhphaa@es*.ee*.ma*.ac*.uk*> wrote (Subject: Re: Did I see the
light
?):-

> Please correct me if I am wrong. A rigid pressure vessel like a torch or a
> submarine hull has its outside exposed to ambient pressure and its inside at
> whatever pressure it is filled to prior to immersion ...

If the hull / torch body / etc is completely rigid. If it is so deep that the
casing would collapse if it was filled with 1 bar of air, but it is actually
liquid-filled, then (surrounding pressure) minus (maximum pressure that the
casing could withstand if filled with 1 bar of air) is being exerted on the
casing's contents, it seems.

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