Everyday physics

Delicious ice cream, why does salt thaw ice?

^* franco.bagnoli@unifi.it

Abstract

During winter, we use to spread salt to thaw ice on the streets. In a physics show, one can be almost sure that after showing this effect, the answer to what happens to temperature will be “it increases”. But no! It goes down, in such amount that one can complement the show by producing hand-made ice creams [1].