I’m quite confused on what the static pressure P is in Bernoulli’s equation. I’m not sure if it’s the external pressure causing fluid to move through, let’s say, a pipe, or the internal pressure within the fluid that’s moving in all the directions.
In: 33
It’s just a known pressure. (rho x g xh)
If you started at sea level, and climbed 30m up a hill, you can poke a flag in the ground that lets you know this is a known elevation (P). So later if you want to measure higher elevations on a hill, you can just start from your known 30m flag and go from there. So now if you climb 50m up from that flag, you know you are at P+50m. (80m).
The P1 in Bernoulli’s Eq is just a flag with a known pressure; an anchor point that lets you calculate P2, the pressure you want.
P1 can be any known pressure in your system. Even right on the surface, at zero.
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