ATA for partial pressures (PPO2, etc.) is pretty much standard
everywhere.  The metric (SI) unit of pressure is the Pascal (Pa), equal
to one Newton (N) of force per square meter (m^2) of area.  SCUBA
applications typically use bar.  1 bar = 10^5 Pa.
1 ATA is approximately equal to 101300 Pa = 1.013 bar.

-Sean


On Tue, 05 Jan 1999 08:52:37 -0500, Art Greenberg wrote:

>Happy New Year everyone!
>
>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?
>
>Thanks.
>
>
>
>Art Greenberg
>artg@ec*.ne*
>
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