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antiquemule t1_jduomrd wrote

Reply to comment by eXecute_bit in TSA stirs debate after ruling peanut butter as a liquid by bwaredapenguin

Not very helpful. Most gels, pastes and other gloop are non-Newtonian and they do not all behave like peanut butter.

To be precise, it is a yield stress fluid, which means that when pushed a little bit, it acts like a solid, whereas when pushed a lot, it flows like a liquid. The (fuzzily defined) amount of push separating the two states is called the yield stress.

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