Hard-to-open jar lids are quite common especially since most are sealed with partial vacuum. While this partial vacuum actually helps keep food fresh, it also makes jar lids stick like fat kid to a muffin. So how do you get them open? With a bit of know-how (science mostly), you can finally get to those goodies inside them.
Grip. Strength isn’t everything in jar lids. Even if you’ve got the arm strength of an Olympic athlete, if you can’t transfer the force effectively, then it can be useless. Make sure that you have a solid grip on the jar lid. You can get those toothed flexible rubber jar lid openers. They do a great job for gripping the often slippery lids. If you don’t have them, a pair of large rubber bands strapped around the lid can also help.
Twist. There is a bit of science to twisting. Use one hand to grip the lid and the other to grip the jar’s body. Twist the one grabbing the lid to the counterclockwise and the one holding the jar clockwise. The combined forces would help you open the jar with ease.
Heat. However, there are times that no matter what mechanical force you apply, you can’t quite get to open the darned jar. This is where heat comes in. Running some warm (not boiling) water around the lid of a cold jar can cause the lid to expand a bit.
Clean. To prevent the same from happening again, make sure that you clean the mouth of the jar and the inside of the lid clean of any food particles. Hardened food stuff can cause the jar to get stuck. If your jar lid gets stuck and this is the culprit. You can lightly tap around the lid to try to dislodge the stuff stuck between the lid grooves. Also, putting warm food inside a jar and sticking the jar in your fridge can cause partial vacuum.
Caveats. Don’t bother with jars with the middle part of the lid popping up. Chances are, the food inside is spoiled.
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