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Water acts like air, according to Bernoulli's principle, because both are fluids. Bernoulli's principle can be applied to various types of fluid flow. Bernoulli's principle is valid for incompressible flows (e.g. most liquid flows like water) and compressible flows (e.g. gases like air) moving at low Mach numbers. A fluid is a substance that has no fixed shape and deforms or flows easily to external pressure. Fluids include liquids, gases, and plasmas.