samtheflash82

making a real "thermos" is going to be extremely difficult, if not impossible using household items. This is because a true thermos has 2 layers, the outer is a shiny, reflective layer to prevent radiant heat loss, the inner is an insulated layer to prevent conductive heat loss. Between the two is the tricky part; there is a vacuum to prevent convective heat loss. Creating a vacuum using household items is not feasible. Tell that to your teacher.