Any pressure difference is irrelevant. The distinction is in the operating fluid.
In pneumatic systems, it's a gas. In hydraulic systems, it's a liquid.
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No, it is the DIFFERENCE between the true and atmospheric pressures.
"in" and "out" are the direction of the pressure.
If you mean locations as in physical location on the earth... Then, differences in pressure between locations can be attributed to their altitudes (or heights) from sea level.
the difference between random and structured packing depend on many thing: 1. gas - liquid contact 2. pressure drop 3. type of solvent 4. etc..
difference between as on and as at