Gauge pressure
Pressurisation of Closed Heating and Cooling Systems (BG82 2022), by Rob Clemson, published by BSRIA in October 2022, suggests that gauge pressure (or bar gauge):
Equates to absolute pressure minus (–) 1.0 bar.
[Atmospheric pressure at sea level = 1.0 bar,
Gauge pressure at sea level = 0.0 bar]
--BSRIA
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