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The Bernoulli Equation can be written as $P + \rho gh +\frac { 1 }{ 2 } { \rho \upsilon }^{ 2 } = \text{constant}$.

The first term in this equation, $P$, represents the fluid pressure, which is equivalent to which of the following?

The work done on the fluid per unit volume.

The internal energy of the fluid per unit volume.

The elastic potential energy of the fluid per unit volume.

The momentum of the fluid per unit volume.