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I think we're talking about two different issues. I understand that the two tanks have different dimensions and, therefore, different buoyancies. What I'm questioning is your assertion that the same volume of gas differs in weight depending on its pressure. Please explain why this would be the case. Further, your example below may not have been you intended. 2600 psi is 2600 psi regardless of what kind of a cylinder it's in so the densities are NOT different. -----Original Message----- From: David M. Thiesfeld [mailto:dthiesfeld@su*.ne*] Sent: 23-Feb-2001 7:13 PM To: Rob Fuller Subject: Re: DIHUL, was: Fins question > The physical size of the containers, for all intents and purposes, is > constant. I.e. they don't become significantly smaller as the pressure > decreases. Agreed, but the two tanks in question have physically different dimensions, ie.. size, length, diameter, weight ,wall thickness material etc..which affects how much water they displace. >So, if you're telling me that a cubic foot of gas is significantly > heavier at 3000 psi than it is at 2600, perhaps you can explain the physics > of this. Imagine two tanks- one holds 3cf of water and the other holds 2 cf of water- both physically different dimensions. now put 104 cf of air at 2600psi in the first tank and 80 cf of air at 2600psi in the second tank. there will be significant differences in the density of air in both tanks. If both tanks had the same exact dimensions then it would be a different story. DT -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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