Why do ballpoint pens spew ink during journeys in summer? | Ink in the refill expands due to heat

Why do ballpoint pens spew ink during journeys in summer? | Ink in the refill expands due to heat

ballpoint pensWhy do ballpoint pens spew ink during travelling?  This does not happen every time but can be seen in summer.  When we go out during summer the pen is affected by the outside temperature. Though the pen and refill are solids, ink is a liquid.  When affected by heat liquids expand more than the solids. So ink in the ballpoint pen expands more than the pen and the refill.  Since there is not enough space inside the refill for the expanded ink, it comes out through small pores.  Fountain pens also face this problems since the ink used them is thin.

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