In order to get good results in relation to observing water pressure at fixtures, it is good inspection procedural practice to inspect the plumbing fixtures at the highest point in the dwelling.
Water pressure will vary depending on numerous things, including the elevation of your structure. Water pressure may also fluctuate during peak demand - the times of day and/or days of the week when water is most in demand. The typical water pressure ranges between 40 and 170 psi.
The hydrostatic pressure is the pressure at any given place in a non-moving (static) fluid. Closed bodies of fluid are either "static" when the fluid is not moving or "dynamic" when the fluid can flow, as in a pipe or by squeezing an air gap in a closed container.
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