Here’s a puzzle; maybe some of my readers can figure it out.
My wife showed me a tiny pinhole that appeared in one of our stainless steel pots. How did this happen? What mechanism could have created the hole?
I took one look and said “cosmic ray hit”. But I was joking.
The pot is a few years old, but has never been used for anything unusual – just a little cooking and storage of food in a fridge.
The hole is just above the penny – you can see the light shining thru it (click on the image for a larger version).
It’s fairly thin steel; about half a millimeter.
Here’s a close-up photo of the hole from the inside:
The hole is about 0.2 millimeters in diameter (the crater is larger).
Here it is from the outside:
So it looks like whatever happened started from the inside.
What did happen?