Microbar

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Microbar �b)</strong> </dt>
The unit of pressure in the CGS system and equal to 1 dyne per square centimeter; the unit of sound pressure. </dd>
In British literature the term barye has been used.
The term bar properly denotes a pressure of 10⁶ dynes per square centimeter. Unfortunately, the bar was once used in acoustics to mean 1 dyne per square centimeter, but this is no longer correct. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use