$p_2$ refers to the pressure at a specific point in a fluid flow system, as indicated in Bernoulli's equation. This pressure is crucial for understanding how energy is conserved and transferred within a fluid, impacting various applications such as fluid dynamics, aerodynamics, and hydrodynamics. The value of $p_2$ is often compared with other pressures within the same system to analyze changes in velocity and elevation, which are key factors in determining how fluids behave under different conditions.
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