Home Physical Why pen can ink flow out?

Why pen can ink flow out?

Why pen can ink flow out?

When you use a pen to write letters on paper, the ink immediately appears. You must have wondered: why when you write, ink in pens will always flow out; When you stop writing, the ink doesn’t flow anymore? Let’s experiment: Plug a small glass tube into a glass beaker containing water; the water quickly rises inside the tube,

pen ink photo
Then we see the water surface in the tube is higher than the water in the glass cup. The phenomenon is called capillary phenomena. The fountain pen is designed to apply this capillary principle. It relies on a series of capillary grooves on the pen’s body and the small opening at the tip of the pen that transports the ink from the inside of the pen to the tip of the pen. When writing the words, the tip of the pen touches the paper, the ink immediately adheres to the paper, leaving the sharp strokes on it.
When I stopped writing, why did the ink in the fountain pen not flow? Let us do another small experiment to make this clear.
Grab a cardboard cover over the top of the glass filled with water, squeeze the cover tightly, and quickly flip the whole glass and cover upside down, then gently remove the cover. The cardboard board is then sucked into the top of the glass and caught the cup’s full amount of water. What is the strength that supports the cover so that the water in the glass does not flow out? That is the effect of atmospheric pressure. It is the atmospheric pressure that supports the cover and water in the cup. When not writing, the ink in the pen does not flow out because the atmospheric pressure outside the pen is larger than the internal pressure so that it can be kept.


James Smith
I used to look up at the sky when I was a child and wonder what's in those stars. Growing up, when I had the opportunity to contact the source of human knowledge, I had more knowledge about the universe, the natural world, and created laws. Being the founder of Wikiwap is where I can share my understanding of the world around me in a simple way that readers can access knowledge like a child. You and I are parts of the world; life will always be beautiful.


Please enter your comment!
Please enter your name here

- Advertisment -

Most Popular

Why Isn’t The Sky Purple?

Why Isn't The Sky Purple? If you know the explanation for why the sky's blue, you've heard that sunlight is white light composed of many...

How does it rain ?

How does it rain ? Plants need it to grow, animals need it to survive, and the human body needs it to stay hydrated and...

Why does colored light often appear in the sky of the North and South poles?

Why does colored light often appear in the sky of the North and South poles? Colored halos from past to present are very attractive to...

Why do clouds have different colors?

Why do clouds have different colors? You must have seen clouds of many colors. There are fluffy white clouds, dark gray clouds, thanks to gray...

Recent Comments