> n air-tight high quality insulation for the container before worrying about the gel. When you get to that use the second wikipedia source below for high specific heat capacity materials as a starting point to create your gel. Spoiler: ice or salty water might be the best bet for low temp applications like this one. > > If you have a container full of just your product at 5C and you put it in the sun the solar radiation will heat that container with about 1000Watts/square meter. With zero insulation it's going to heat up pretty fast. Sade the box and you reduced the Watts/square meter that you need to deal with. Insulate the box and you change the speed that heat energy can move from the box surface to the box interior. Now you can't use these techniques to completely solve the heating problem, provide a reservoir of cold mass that can soak up a lot of energy without changing temperature. This is where the heat capacity of your gel (or whatever, it could be a container of ice) comes into play. > > Water is a great example of this since water has a very high heat capacity. To illustrate it put plain water ice in a pan and turn on the heat. The ice will soak up a lot of energy turning to liquid before allowing the temperature of the water in the pan from rising above 0C. (this is in an ideal case of course blah blah assumptions, massless pistons and frictionless surfaces, etc) > > Read more about specific heat capacity:

I was looking at the best insulation for protecting stuff from heat, and found Aerogel to be one of the best, do you think this would also work as insulation for keeping something cool like this?

with that, and salt water Shell inside, i feel like the internal temp would remain pretty cool.

its probably a bit costly with the cost of aerogel and the precautions you got to take handling it etc