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On Thu, 23 Nov 1995, Andy Hall wrote: > > > > >Since the ambient pressure would be transmitted from the walls of the > > >torch through the fluid filling, it would act directly in the bulb. > > Please correct me if I am wrong. > A rigid pressure vessel like a torch or a submarine hull has it's > outside exposed to ambient pressure and its inside at whatever pressure > it is filled to prior to immersion. So in a submarine the crew are only > ever exposed ( as near as makes little difference ) to 1 atm pressure. > That's why they can dive as deep as the pressure hull allows and ignore If you fill a torch (or a submarine hull) with incompressible fluid, then even a miniscule (infinitely small) movement of the external hull will transmit the external force. Same principle applies to hydrostatic testing of tanks . If the bulb (glass after all) is completely rigid, then the force exerted on its outside will be equal to that on the outside of the torch. If the glass bulb compresses a bit, then some of the pressure will be taken-up by the torch hull. If the glass bulb compresses a lot, then ...blammo! If the TORCH was completely rigid, then it would not flex, and none of the external pressure would be transmitted.... but if that was the case, you wouldn't need to fluid-fill the thing. regards, Bernie Woolfrey
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