Anonymous asked: Hi Hank :) Thank you for everything you do!! I have a question: is peanut butter a solid or a liquid?
All dichotomies are false dichotomies…there are things that have the properties of a liquid and a solid. Pitch, for example. But the grade-school definition is “if you can pour it, it’s a liquid.” And you can’t pour peanut butter.
Also, I feel I should note that, for the purposes of airline security in the US, peanut butter is a “gel”, meaning that you can’t take it on planes because it might be some kind of disguised explosive.
It’d be better to use the engineers definition of a fluid.
If the material is deformed continuously when acted upon by a shear stress, then it’s a fluid.2 months ago