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.
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In Bernoulli’s equation, the static pressure P is the pressure of the fluid when it is not moving or when it is moving at a constant velocity. This is the pressure that the fluid exerts on the walls of a pipe or other container when it is not flowing or when it is flowing at a constant speed. The dynamic pressure is the pressure of the fluid when it is moving and its velocity is changing. This is the pressure that the fluid exerts on the walls of a pipe or other container when it is flowing and its speed is increasing or decreasing.
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