The discussion revolves around the question of why ink in a pen refill does not flow back when the pen is held inverted. Participants explore various factors that may influence this behavior, including physical properties of the ink and design features of different pen types.
Participants do not reach a consensus on the exact reasons for the ink's behavior, with multiple factors being proposed and discussed. There is acknowledgment of both mechanical and physical properties influencing the situation.
Some assumptions about the properties of ink and pen design are not explicitly stated, and the discussion does not resolve the complexities of fluid dynamics involved in this scenario.
This discussion may be of interest to those curious about the mechanics of writing instruments, fluid dynamics, and the historical development of pen technology.
My experience is that a ball point pen, left upright with the ball at the top will eventually leave the ball dry an it will no longer work. The cheap ones will not write many words upside down.Benjamin_harsh said:Problem Statement: Why does the ink in refill won't flow back if I hold it inversely?
Why does the ink in refill won't flow back if I hold it inversely? What stopping it?