In physics, a fluid is anything that flows. This includes both liquids and gases. Unlike solids, fluids cannot resist a change in shape. They take the form of their container. Key Properties of Fluids
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Pressure is the result of fluid molecules bumping into things. It is force applied over an area. In physics, a fluid is anything that flows
Laminar flow is smooth and orderly; turbulent flow is chaotic and swirly (like white water rapids). Compressible vs. Incompressible: Can you squish it? Air is compressible; water mostly isn't. Where You See It Every Day They take the form of their container
This calculates the pressure at a certain depth in a liquid. $$P = \rho g h$$