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James R: Your swimming pool analogy demonstrates that liquids in unsealed containers, like water in a swimming pool, have certainly got a pressure differential. That is also true of the atmosphere; pressure reduces with height. But gases in sealed cylinders act in a counter-intuitive way...

It is remarkable how the answers in this Canadian/ North American forum mirrors the answers given in the Australian forum. In each case, the vast majority of respondents gave the intuitive, but quite wrong answer that there would be greater pressure at the bottom of the Very Long Cylinder...

ImaHamster: Yay! A counter-thought experiment! A perfectly valid option in a Scientific discussion. I say, no, there wont be a 'rush' of air to save little Hamster's life, but he will survive. If he can survive at 14000ft, that is. Why 14000 ft?, I hear you cry in unison. Consider...

Counterbalance: Your input is welcome. The wonderful thing about Gedankenexperimenten, Thought Experiments, is that you can arbitrarily remove all the complicating and misleading variables, and reduce the problem to its basic form. The wonderful thing about Forums, too, is that we can...

Q: Thanks for entering the discussion with such a helpful input. This conundrum has been put to hundreds of Forum members in Australia, and I thank you for increasing my Minority of One to a Minority of Two.

The consensus seems to be that a pressure differential will exist between the top and bottom of our VLC. So, can I take it that you are comfortable with the proposition that a pressurised gas will segregate itself into regions of high and low pressure, WITHIN A SEALED CONTAINER, just so long...

Thanks to all Forum Members for their input into the very Long Cylinder (VLC) thought experiment. A little clarification. The pressures are measured non-intrusively and magically and accurately, as X psi, + or - say .0001psi. The atmosphere is of constant temperature, and insulation is not...

IMAHAMSTER 2: Your reply brings variables into an extremely simple scenario that are unnecessary, and confusing. In essence, the question is: If a very long sealed pressurised cylinder is lifted from Horizontal to Vertical, will there be a pressure difference between Top and Bottom...

Chagur: Thanks for your contribution to what I hope is a vigorous exchange of ideas. I am somewhat surprised at your statement that there will be a pressure difference even at sea level between the ends of the Very Long Cylinder. Would you like to give your reasoning for this statement...

Stryder: You have brought into the extremely simple thought experiment variables which merely serve to confuse matters. The original question is very simple; A closed Very Long Cylinder was pressurised at Sea Level. allowed to equilibrate, sealed , and then hoisted by miraculous means, (...

The following is a continuation of a fascinating SSSF forum debate going on in Australia. It will be a great opportunity to see if Canadians and Americans can out-think the Aussies. The thought experiment is this: A very long sealed cylinder is pressurised to X psi with air. At...

My question has relevance to Cryptography and randomness. If an ordered series, eg., 1,2,3,4 ...... is numerically added to a second random series of numbers of any magnitude,eg., 4987,0024,501032,339,054093,...... is the resulting series of summed numbers: Random?, or Ordered...

Studying in Australia Studying in Australia for a Canadian is a very sensible move; the social mores, language,political system, monetary system and educational system are similar, if not near-identical. I live in Adelaide, a city of 1.2 million, which is both cosmopolitan and cheap to live...

Hollywood has made some terrific scenes on the theme of an elevator plunging after some mishap. Can anyone point to any credible report of this ever happening?

Don't ask about weather in Australia.... Never bother to ask about the weather in Australia...... The answer is always the same, Beautiful yesterday, Perfect today. Greetings from the Antipodes to all Canucks and Yanks, Swedes and others. Why not join our Lively and Speedy forum...

The Movie Industry has made some thrilling scenes of plummeting elevators, and the death and destruction waiting on those trapped in a falling elevator is taken as an established fact. Can anyone provide a reputable and verifiable report of such an accident ever happening? I'm sure there...