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--=_ORCL_6518706_0_11919608141218100 Content-Transfer-Encoding:7bit Content-Type:text/plain; charset="US-ASCII" Actually, George is right - as I drove home last night I realized this COULD be viewed as a stupid question. An indicated depth of 20 ffw as measured by a depth gauge would represent a pressure of 1.6 ATAs regardless of altitude, since depth gauges measure pressure, not depth. If you decoed on a shot line, then the absolute pressure at an actual depth of 20 ffw would be significantly less than 1.6 ATAs. At Harvard, since everyone is pretty smart, you learn the humility to admit when you are wrong (it'd be nice if more people on the lists had this quality). John ------------------------------------------------------------ John H. Heimann Sr. Product Manager Oracle Corporation Security Products 500 Oracle Pkwy, Box 659410 415-506-9750 (phone) Redwood Shores, CA 94065 415-506-7226 (fax) --=_ORCL_6518706_0_11919608141218100 Content-Type:message/rfc822 Date: 14 Aug 96 04:26:51 From:"gmiiii@in*.co*" <gmiiii@in*.co*> To:JHEIMANN.US.ORACLE.COM,<JHEIMANN@us*.or*.co*>,techdiver@terra.net Subject:Re: High altitude decompression In-Reply-To:<199608140030.RAA10408@ma*.us*.or*.co*> X-Mailer:SPRY Mail Version: 04.00.06.17 MIME-Version: 1.0 Content-Transfer-Encoding:7bit Content-Type:text/plain; charset="US-ASCII" John, call Harvard and demand your money back for that physics degree. I would insist on it. There is nobody on this list who has both an iq above room temperature and any diving experience. Try writing "Dear Abbey". -G On 13 Aug 96, "JHEIMANN.US.ORACLE.COM" <JHEIMANN@us*.or*.co*> wrote: >I have been thinking about some deep diving in Lake Tahoe, which is at an >altitude of approx. 6000'. I know that decompression profiles are >significantly changed by the reduced atmospheric pressure. What I have been >wondering is how depth limits based on PO2s are affected. At first thought, I >would think that one could breathe a given mix at a deeper depth than at sea >level, since the absolute pressure at any given depth is less than at sea >level. E.g., a decompressing diver could go on O2 at something like 24 ffw >instead of 20 ffw and still maintain a PO2 limit of 1.6 ATA (I don't want to >argue here about whether 1.6 ATAs PO2 when breathing O2 at 20 fsw is safe; >this is just an example). > >John > >------------------------------------------------------------ >John H. Heimann Sr. Product Manager >Oracle Corporation Security Products >500 Oracle Pkwy, Box 659410 415-506-9750 (phone) >Redwood Shores, CA 94065 415-506-7226 (fax) > >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. > > George M. Irvine III DIR WKPP 1400 SE 11 ST Ft Lauderdale, FL 33316 954-493-6655 FAX 6698 Email gmiiii@in*.co* --=_ORCL_6518706_0_11919608141218100--
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