This isn't actually a homework question, but I didn't want to clutter the other forums because I couldn't do my own calculations. This is to try and find viable ways of storing energy away from a modern society, and any help would be greatly appreciated. For (some) ease, say this container has the same properties as a standard thermos flask, other than size. 3 cubic metres of table salt are heated to 800 degrees centigrade, and stored in this container. (we can assume the container is completely filled) If we take the temperature outside to be 20 C, and it's stored simply in the air, how long would it take for the salt to reach 100 C? I understand people are loathe to simply answer others' questions for them, but I really am not sure how to go about approaching this. Whilst I have some degree of knowledge of advanced physics ideas, the level of equations I've properly covered don't go much more advanced than the most basic of kinetic energy's set (I'm 16, heh). I would appreciate any help I can get, as I'd really like to figure this out.