I am working on a personal project, however I know nothing about chemistry and I would like to ask you guys for a quick question. I need to use a liquid for my project, which after being put into a freezer will freeze, and will be kept frozen for the most time when taken out of the freezer into room temperatures.
Ideally I would like to know if there is a liquid which can freeze after a couple of hours, and when taken out from the refrigerator it can sustain a temperature of -2 -3 degrees for the longer period, in normal room temperatures. And most importantly it can me used again and again.
Thank you so much guys, I will be looking forward to an answer on this one.