Bernoulli's equation demonstrates that the pressures at two points (P1 and P2) in a fluid system can be considered equal when both points are exposed to atmospheric pressure, leading to the derivation of Torricelli's equation. This principle applies specifically to fluid exiting a spigot, where the internal pressure at the exit point matches the atmospheric pressure. The discussion clarifies that while the internal pressure is crucial, it must equal the external atmospheric pressure at the open ends of the streamline.
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Yes, it's the pressure inside the fluid. At those points that pressure must match the external atmospheric pressure.bluejay27 said:Isn't the pressure supposed to be internal pressure?