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> >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 ascent rates and never get bent. The only increase in pressure change inside the hull will be due to the change in volume of the pressure hull under compression ( quite small I guess). Likewise if you fill the torch or submarine with a liquid ( incompressible ) the pressure transmitted to anything in the liquid inside the pressure vessel (such as the torch bulb or battery) will be the difference between the ambient pressure and the reaction exerted by the pressure hull (torch body). The pressure inside the torch would only be ambient if it was liquid filled and was a flexible space i.e. had a flexible diaphraghm on one end. In this case I don't think the bulb would last very long ! > >wonder at what pressure the bulb would implode. Also, any gas spaces in > >re-chargeable batteries and electronic components...... > > regards, Bernie Woolfrey > > > I think that the air spaces could be filled in the batteries as suggested by > Doug Chapman. The electronic components are not supposed to contain any gas > but must contain some residual gases from construction. A valve to expulse > the gas created during the rechargement of the battery is a very good idea > too. About the bubble, could anything else than a bubble be used ? > > Brainstorming mode on ... The way to make a torch that goes deeper could be to hydrostatically pressurize and seal at the surface. That way you would reduce the load carried by the body of the torch at depth. Cheers, Andy.
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