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Viscosity is a measure of a fluid's resistance to flow. It quantifies the internal friction in the fluid as layers move past one another. The formula for dynamic viscosity is given by Newton's law of viscosity, $\tau = \mu \frac{du}{dy}$, where $\tau$ is the shear stress, $\mu$ is the dynamic viscosity, $du$ is the change in velocity across a distance $dy$ between two fluid layers.

Bernoulli's Equation relates the pressure, velocity, and elevation of a fluid in steady, incompressible flow along a streamline. The equation is given as $P + \frac{1}{2}\rho v^2 + \rho gh = \text{constant}$, where $P$ is the fluid pressure, $\rho$ is the fluid density, $v$ is the fluid velocity, and $h$ is the elevation height above a reference plane, with $g$ being the acceleration due to gravity.

The Reynolds Number is a dimensionless quantity used to predict the flow regime in a fluid. It is calculated using the formula $Re = \frac{\rho \cdot U \cdot L}{\mu}$, where $\rho$ is the fluid density, $U$ is the velocity of the fluid, $L$ is a characteristic linear dimension (like diameter of a pipe), and $\mu$ is the dynamic viscosity. Laminar flow occurs at low Reynolds numbers, while turbulent flow occurs at high Reynolds numbers.

Pressure is defined as the force exerted per unit area. In fluid mechanics, pressure at a point in a fluid is isotropic and can be calculated using the formula $P = \frac{F}{A}$, where $P$ is the pressure, $F$ is the normal force, and $A$ is the area over which the force is distributed.