from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physics A rheological phenomenon in which certain colloids solidify more quickly when subjected to shear


from Wiktionary, Creative Commons Attribution/Share-Alike License

From rheo- (“current”) + -pexy (“fixing (in place)”)


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  • "An incorrect example often used to demonstrate rheopecty is cornstarch mixed with water, which resembles a very viscous, white fluid. It is a cheap and simple demonstrator, which can be picked up by hand as a near-solid, but flows easily when not under pressure. However, cornstarch in water is actually a dilatant fluid, since it does not show the time-dependent, shear-induced change required in order to be labeled rheopectic. These terms are often and easily confused since the terms are rarely used; a true rheopectic fluid would when shaken be liquid at first, becoming thicker as shaking continued."


    April 7, 2017