Question

difference between formula of pressure and formula of pressure in fluid​

Answer 1

Pressure is Force divided by Area. Popular English units are Pounds Per Square Inch (psi) and Pounds Per Square Foot (psf).

Normal atmospheric pressure (at sea level) is roughly 14.7 (also called 1 Atmosphere (or 1 ATM). The most common cause of changes to this value are increases in altitude (about half that pressure for every 18K feet you ascend) or the minor fluctuations (2–5%) caused by weather (lower for approaching storms, higher for dry sunny days).

To the point of your question, pressure difference (or differential) is found by subtracting one from the other.

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