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When we eat hot soup,you often don't know how hot they are. If you had a spoon which can distinguish the temperature,you wouldn't be heat up in hot water. The hand shank of the spoon uses the thermo bimetal that can change the shape with temperature changing. If the soup is very hot,it will swell to remind you. What's more,before you stir the coffee, you can try it!
Nanjing Forestry University