This is one of the easiest concepts to understand, and the most misunderstood one.

Atmospheric pressure is essentially the pressure exerted from the atmosphere to the earth (or us) or any object in the surface.

We gotta use TOTAL pressure when talking about absolute pressure.

If you use Gauge pressure, you gotta use always gauge pressure.When dealing with Ideal Gas, use Total Pressure.

P total = P atmospheric + P gauge

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