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On 5 Jan 99, at 8:52, Art Greenberg wrote: > Here in the U.S., when talking about the partial pressure of > a component of our breathing gas we speak in units of > atmospheres (standard) absolute, or ATA, where 1.0 ATA is > equal to approximately 14.7 psi. > > What units does the metric world uses for this measurement? For diving applications, I think nearly all measurement is done in ATA, as the fractions are well behaved, as they are expressed in terms of 1 atm at the surface. The metric unit of pressure is the Pascal, usually expressed in kiloPascals (kPa). 1 atm == 14.7 psi == 101.2 kPa 1 Pascal is equal to 1 Newton of force per square metre of area. Note that mass and weight are different units, with 1 kilogram == 1 * 9.79 == 9.79 Newtons (with 9.79 being the acceleration due to the Earths gravity) So: 14.7 pounds == 6.6678 kg == 65.2778 N 1 square inch == 0.00064516 square metres 14.7 psi == 101180 Pascals == 101.180 kPa I actually have a pressure gauge metered in kilograms per square centimetre.... :) Useless. The other common metric measure is the Bar, where 1 atm == 1 Bar. Again though, when discussing partial pressure, I have not heard of anything other than atm being used for units... Brian. -- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ + grnbrg@cc*.um*.ca* + NETDOC Developer, Libraries Electronic + + PGP public key available. + Technologies and Services + ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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