I was wondering if there is a good insulation like a gel or a substitute that helps food stay cold for longer periods of timeSomething that acts like water that can hold cold for long periods of time but handles large heat like a microwave but will keep its heat wellIs there such thing? Please help!
There's two things hereInsulation will keep the heat from outside getting in (to the food), but something like ice that is right next to it (and inside the insulation) will take heat from the food itselfSo they work together to keep the food cold, but in different waysAs ice changes to water (at 32F/0C) it absorbs a lot of heat, and the same phase change effect is used in a freezer block Insulation will also keep hot things hot, and something like a pocket hand-warmer could, perhaps be used to generate heat (again through a phase change) With the added advantage that it doesn't start doing so until the little clicker in the sachet is activatedNot sure if they are safe near food, though! Similarly, melted wax will give out a lot of heat as it solidifiesWhich would be interesting, but again, not very practicalThe self heating cans of food (and coffee!) generate heat by a chemical reaction as water reacts with quicklimeHighly dangerous if it goes wrong, but it worked for me!
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