We tested four different bottles of hot water, three with insulators and one without, to see what temperature the water would be after 40 minutes. We used fleece, foil and bubble wrap as our insulators. We also used a control to see what would happen if there was no insulation. We used the LogIT to measure the temperature of the water.
We found out that some of the insulating materials worked better than others. It turned out that fleece was the best insulator.
Can you think of any other materials that might insulate better?