Fluid (pheesics)

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In pheesics, a fluid is a substance that continually deforms (flows) unner an applee'd shear stress. Fluids are a subset o the phases o matter an include liquids, gases, plasmas, an tae some extent, plastic solids. Fluids are substances that hae zero shear modulus, or, in simpler terms, a fluid is a substance which canna reseest ony shear force applee'd tae it.