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The Little hole in the side of a pen:
At a first glance, it might strike you as just a design but it is
there for a reason and meant to serve a good purpose.
Without the hole, a pen will be completely airtight and as you
write and use the ink, the pressure will fall preventing the ink
from flowing to the tip and eventually the pen will cease to
write although there is still ink in it.
On highlands or in planes where the pressure is lower, a pen
with no hole can explode soiling your attire with ink. The
hole equalizes the pressure in the pen to allow it to write. So
the next time you see it, you should know it is not just there
for fun.
Know that today, in case you never knew.
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Title :
Did You know?
Description : . The Little hole in the side of a pen: At a first glance, it might strike you as just a design but it is
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