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+Hydrostatic equilibrium and fluid motion.
+
+Fluids include gasses and liquids.
+
+- For a gas, the density changes readily, and the molecules are far apart.
+- For liquids, molecules are close together, and the density remains basically constant
+
+A fluid is defined as a matter that flows under the influence of external forces.
+
+Fluids cannot maintain a fixed structure, but fit the shape of the container they're confined to.
+
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