"Jar lids rely on a vacuum seal to stay closed, which is why they pop when you finally open them. The pressure is equalized and the center of the jar lid pops up. Piercing the lid performs the same function as loosening it because the pressure equalizes and no longer holds the jar closed. However, there is a minor issue with this method because it leaves a hole in your jar lid."
"The type you squeeze together while turning a handle needs the lip of a can to work properly, but it may have a more basic can tapper on it somewhere, sometimes even the handle. You can also use a can tapper style opener that has a flat bottle opener on one end and the triangular metal piercing tapper on the other. All you need to do is use that pointed blade to pop a hole in the jar lid."
Stubborn jar lids often remain closed because of a vacuum seal. Piercing the lid with the pointed tapper of a manual can opener equalizes pressure and breaks the seal, allowing easy opening. A manual can opener or a can-tapper style opener with a triangular piercing tip can be used to make a small hole; the hole need only be large enough to release pressure. Piercing the lid leaves a hole, so it should be used as a last resort or when the remaining contents will be used or transferred. Alternative methods include levering a butter knife under the lid lip.
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