WAEC Physics 2014 Theory — Question 17
Question 17 of 22 from the West African Examinations Council (WAEC) Physics 2014 Theory paper, with the correct answer and a full explanation.
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9(c). Explain how a tightly fitted glass stopper could be removed from a reagent bottle.
Model answer
The neck of the bottle (around the stopper) is gently heated, e.g. by running hot water over it. The glass neck expands due to the heat faster than the stopper inside it, loosening the grip and allowing the stopper to be removed.
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