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The study of fluids (liquids and gases) in motion, and the forces acting upon them. It's the science of flow, pressure, drag, and turbulence, essential for designing everything from submarines and aircraft wings to arterial stents and planetary weather models. In an alien context, it expands to "xenohydrodynamics," modeling how strange fluids—like liquid methane on Titan or supercritical carbon dioxide on Venus—behave under different gravities and temperatures. It answers questions about alien ocean currents, atmospheric circulation, and the design of vehicles meant to navigate non-water seas.
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