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i gotta make a thermos to keep a hot liquid hot using recycled materials and 1 2L bottle and 1 500mL bottle

any ideas wats a good insulator to keep between the 2 bottles or how do i create a vacum between the bottles w/o them collapsing?

(the small bottle is inside the large bottle)

well vacuum is obviously the best, but it would be hard to create, so the alternative would be air.

I had a project like this a year ago but I didn't really score all that well.
The best results in my class were from from 'piepschuim' donno what the name is in english, foam perhaps?
Anyways, we had to keep boiling water as hot as possible for 15 minutes and extremely tight packed foam was the best with 94 degree after 15 minutes.

If you cover it up good and wrap it around all kinda foils and stuff you could use just use a teacan, which is what I did, but apparently those things aren't as good as tight packed foam.

If your teacher is handing out rewards for originality go for straw and salt, works crap but some geek in my class still got a better note than me >_<".

this is the "foam" I am talking about

http://www.mistymountains.nl/materialen/schuim.jpg

If it has to be recycled crap, try using tightly packed shredded newspaper. They use the same thing (treated with crap to make it less flamable and stuff) in some houses for insulation.

ok basic science


you need foil to reflect the radiation emiting from it to keep it warm
you need vaccuum space around the container as normal heat cnt travel across a vaccuum
then just some normal insuation i dunno wool or sumit around it and you should keep it very hot for a while


i think thats right but for some reason it dont look right once i typed it out il do my research and double check its been a while

put some foil around it then some tyvek?