Let's make "Hiyaron" !!

The purpose of experiment

By using a chemical reaction, I want to make thingｓ that absorbs heat

The things which the experiment need 　 　　・Ammonium nitrate 　　・Urea 　　・Ziploc 　　・Tissue paper 　　・Distilled water 　　・Charta 　　・Electronic balance 　　・Medicine spoon