How is it a ballpoint pen which did not work previously, miraculously starts working again when you make a few scratches with it on paper? What’s the mechanism behind it?
In: Engineering
Think about what “ballpoint” means. It’s basically a tiny ball bearing held at the end of a tube of ink. As it rolls, it transfers ink from the inside of the tube to the paper. So if you don’t use it for a while, the ink on the outside will be dry or rubbed off; “scratching” it on paper gets the ball rolling again so the transfer of ink can resume.
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