I have this button on a few jars around the house like jam jars, they are always glass. Why does the “button” pop once and never again?
In: Physics
Imagine putting Tupperware in the fridge. When the air inside the container gets cold, it pulls the lid in tighter.
When the pickles are made, they are canned at a high enough temperature to kill germs, that’s important.
When the hot air inside the jar cools down to room temperature, it sucks the button down.
When you hear it pop, you know it was canned at a high enough temperature to kill the germs AND not opened since then.
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