Physics, 02.07.2019 00:30, jolleyrancher78

25 points me i have to make a thermos in science class using a styrofoam cup, cottonballs, and tinfoil. it has to keep water cold for as long as possible. what is the best way to make a thermos out of this stuff to keep it cold? tape cottonballs around the cup and put tinfoil on the outside? i have no idea me . : )

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25 points me i have to make a thermos in science class using a styrofoam cup, cottonballs, and tinf...