Fountain pens use tiny tubes to keep ink from dripping. Imagine you're drinking a soda through a straw, the more you suck, the more soda comes up. A fountain pen is like that, but it uses capillary action to control how much ink moves. When you write, the ink flows out just enough to make your letters, and then it stops until you need more.
Examples
- A fountain pen is like a straw that only drinks when you write
- The ink flows up the straw just enough for your letters
- It stops flowing until you need more writing
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Categories: Science · fountain pens,capillary action,science of writing