Question

What are some good insulators?

I'm doing a project for school where I need create a lunch box that contains NO stroyofoam. I also need keep a popsicle frozen for as long as posiable.

What would be a good insulators?

Answers

Use plywood to make the box.

Line the inside surface with aluminium foil with shiny side to the wood.

Next use some heavy cardboard about ? inch thick next to the foil.

Put another layer of foil with the shiny side inwards.

Glue a layer of cotton wool to the outside and and wrap in plastic.

Make a lid in the same way.

Put the popsicle inside and seal the lid with duct tape.

#1

very light wood like balsa, cardboard, or use double pane uv shielded thermal glass (then it would be clear)

#2

the best insulator is a vacuum. this is the principle of the thermos bottle. a layer of glass next to another layer of glass separated by a vacuum is used in a DEWAR flask to keep liquid nitrogen from boiling.

most cryogens are stored in dewar flasks to prevent boiling (think 350 degrees below zero)

#3

cork, sponge rubber

#4