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To: Graeme
To: Davison <graeme_davison@ma*.ne*.co*>
Subject: Re: Bottle Pressure, weight
From: James Green <james@sa*.ci*.ac*.uk*>
Cc: scuba-uk@me*.co*
Cc: techdiver@opal.com
Date: Thu, 18 May 1995 16:09:01 +0100 (BST)

On 18 May 1995, Graeme Davison wrote:

> 
> In addition last time I looked a 300 bar 7l weighed the same as a 232 bar 10l
> (and has less gas)
> 

I have seen 300bar Faber cylinders recently in London which seem pretty 
attractive 12l 300bar - same mass as a light/w steel faber 15l 232bar (about 
15.8 kg I think) - and holding slightly more air - add to this the fact that 
since the bottle is smaller externally - you can take some of that 
lead off.   

a 10l 300bar are also available.  

I don't realy know about difficulties mixing to 300bar - but I would have 
thought that even if ideal gas laws do not apply some model could still 
be used to produce an accurate mix.

BTW since this is going to the World Wide as well - do serious US divers 
realy use bottles with lower pressures than 232bar?  Divers in the UK
are slowly moving to 300bar.  

James Green                             Email: james@sa*.ci*.ac*.uk*

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