What is a good material to make my own thermos out of?(GRADE 7)NO scientific equipmentI?

Answer 1

You need atleast two different size containers, one smaller than the other and fitting inside that. Between the two containers, you can put some glass wool or find wood chips or thermocole pieces or ufoam pieces. Well, you will have a crude thermos, not as good as the double walled glass vessel with the inside surfaces mirroreed and evacuated, but some thing to keep things hot or cold for a couple of hours.