🚀 go-pugleaf

In article <4c187448$0$17177$afc38c87@news.optusnet.com.au>, "Peter Webb" <webbfamily@DIESPAMDIEoptusnet.com.au> wrote:
>You can't siphon a gas.

Nonsense.  You need to think more broadly.

>The gas in the upper reservoir would simply disperse into the atmosphere. 
>You could enclose the gas at each end in some flexible membrane, but this 
>would cause the pressures at each end to equalise and there would be no 
>force to push the gas through the "siphon".
>
>BTW, siphons work because atmospheric pressure pushes the liquid through the 

Nonsense.  Syphons work by gravity, not atmospheric pressure.

>siphon. That is why they don't work in a vacuum. If the atmospheric pressure 
>is low enough at the receiving end, siphons can pump water up hill (ie 
>against the force of gravity).

Sounds like a typical suction pump to me.

>"terryc" <newsninespam-spam@woa.com.au> wrote in message 
>news:hscssf$3ii$1@speranza.aioe.org...
>> On Tue, 11 May 2010 19:47:54 +0000, Don H wrote:
>>
>>> It seems the Oxford dictionary (and others?) has an incorrect definition
>>> of "siphon"; attributing the agent involved as atmospheric pressure, not
>>> gravity.
>>>   But the key aspect of a siphon is surely that it is a tube with one leg
>>> longer than the other - but makes a "fluid' (liquid; gas) go upwards,
>>> before descending.
>>>   Hence, the fluid "defies" gravity, before succumbing to it.  How?
>>>   Presumably, because of internal cohesion of the fluid concerned - the
>>> molecules drag each other along (viscosity?); otherwise, the whole
>>> system just wouldn't work.
>>>   The agent involved may well be gravity - but can you siphon a gas?
>>
>> Yes. Think of pools of gas, e.g. cold air. The critical part of the
>> gravity siphon explanation is that both legs/tubes of te siphon are
>> filled with the gas that you are siphonig. 


Cheers, Phred.

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