Why slapping on the bottom of a jar makes it easier to open?
In: 39
This, and why tapping the sides of it with a knife help lol…I never really understood it!
The lid gets stuck because it creates a strong seal between the jar and the lid. Sapping the bottom of it causes a pressure wave to travel from the bottom to the top at the speed of sound which could help dislodge the the lid ever so sightly breaking the seal.
Slapping the bottom of the jar is just warm-up for the finger and wrist muscles it takes to actually open the jar.
Pressure wave sorta thing. It moves the stuff, which compresses the air above, which pushes on the lid, and loosens it as it can only give in one direction. It also heats it up.
You might change the pressure or force the cap open a little but I feel it’s a stretch to say it actually helps.