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Fluidity vs. Rigidity

·4 mins
A fluid is anything that flows, which includes gasses and liquids. Some fluids even exhibit both properties of solids and liquids, such as in response to shocks (i.e., water with corn starch, a “non-Newtonian fluid”). Ketchup is an example of a substance that does the opposite: it exhibits solid properties until it’s disturbed, after which it flows, which is why shaking or pounding on the bottom of an upturned bottle of ketchup will make it pour out.