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We often eat canned food,sometimes its hard to open the glass can.That is because vacuum packing makes the air pressure inside is lower than the outside.Co Stickers using the principle of thermal expansion，stick it on the bottle cap of the can, then tear the surface layer.The heat form the chemical reaction will heat the air , lower the pressure difference of inside and outside,which makes it easy to open the canned.
Dalian Minzu University