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Why do pens explode?

Updated: 9/13/2023
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9y ago

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They don't really "explode" per se, it's due to a process called thermal expansion. The ink in a pen is liquid in a confined tube, mostly sealed at the "ball-point" end, but open at the other. Increases in temperature from body heat expands the liquid much as Mercury rises in a thermometer, until it exits the tube causing a mess.

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