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Heavily edited. > I can get at the local office supply store, for CDN$100, a postal scale that > will measure to 0.1 pound accuracy, with a max weight of 200 pounds. > 60 mols of Helium == 60 * 4 grams = .5 pounds of He > Comments? 1. Plus or minus 5% on helium doesn't strike me as where I want to be. 2. A whip that doesn't appreciably change apparent weight would be tricky at best. It would probably eat any savings from the scale being cheaper (if indeed it would be). 3. Any time savings from disregarding temperature would be eaten up by dealing with the changes in tank tare weight and gas weight from tank to tank and with screwing with that magic fill whip. Check http://www.diverlink.com/gear/tanks.htm to see how much tank weight and capacity changes from manufacturer to manufacturer even within a stated size. 4. Blending with a scale on a boat would be an adventure. Perhaps an institution with many tanks of the same size would be able to make it work. I can't see a scuba shop or club pulling it off. My bottom line is gas weight is probably better left to people who deal with things like LPG, carbon dioxide, HFCs and CFCs (stuff that liquifies at pressure). They don't have much choice since pressure doesn't tell them much beyond gas temperature. Don Burke ____________NetZero Free Internet Access and Email_________ Download Now http://www.netzero.net/download/index.html Request a CDROM 1-800-333-3633 ___________________________________________________________ -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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