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Why there is a small hole on the barrel of a nonretractable ball point pen?
Wiki User
∙ 16y ago
Excellent question. Its there to allow air to enter the interior of the pen while the ink flows out. This ensures a smoothe and even flow of the liquid ink. It works on the same principal as why we poke two holes in a can of oil or juice. As the liquid flows out, the air flows in to replace the volume. Without this you get that gurgle that an inverted water bottle makes as it dispenses a cup of water. This hole also allows for the passage of air to flow out as the ink will expand a little when placed in sunlight or in a pocket. This prevents the ink from being pressured out the ball point end.
Wiki User
∙ 16y ago
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