How does a ballpoint pen work?

How does a ballpoint pen work?The tip of a ballpoint pen, the part that writes, is very tiny metal ball in a socket. As you write, the ball spins, so that the ink is put evenly on to the paper. The side of the ball which you can’t see is in contact with the cylinder which holds the ink, so that ink always moves evenly over the ball and makes the pen write smoothly.

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