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In physics, a fluid is a liquid, gas, or other material that may continuously move and deform (flow) under an applied shear stress, or external force. They have zero shear modulus, or, in simpler terms, are substances which cannot resist any shear force applied to them.

AI overview

A fluid is any substance—like water, air, or oil—that flows and changes shape when a force is applied to it, rather than staying rigid like a solid. Fluids matter because understanding how they move and respond to forces is essential for everything from engineering pipelines and aircraft to predicting weather patterns.

AI-generated from the Wikipedia summary — may contain errors.