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It depends on the context.

For pneumatic systems, Pounds per square in (PSI) or Bars (or officially, MegaPascals, MPa), where 1 Bar is "Standard" atmospheric pressure at mean sea-level at 20ºC.

For weather, milliBars (mBar), because weather systems are variations of no more than a few tens of mBar above or below the mean, 1 bar, level.

Sound-level calculations use deciBels (logarithms of ratios) of quantities of the incredibly tiny micro-Pascal, which is one-hundred-thousand-millionth of 1 Bar!

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7y ago

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