Water rising through the interior of a vessel that covers a candle over a plate with water: an experiment poorly understood, analysis of a persistent error and proposals to overcome it

DOI

https://doi.org/10.25267/Rev_Eureka_ensen_divulg_cienc.2024.v21.i2.2203

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Experiences, resources and other work
2203
Published: 12-06-2024
PlumX

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Abstract

The experiment of covering a lit candle in a water basin is an educational resource widely used to show students what happens when the pressure inside a container becomes lower than atmospheric pressure. Although the experiment is simple, quick, and easily reproducible, it is likely not to be understood by most of the audience, as inferred from the analysis of the responses given by students and university graduates when asked to explain why water enters the glass as soon as the candle flame weakens. In the second part of this article, and to facilitate the understanding of this experiment and analyze certain aspects of the combustion of a candle, a collection of complementary experiments is proposed that helps comprehend what takes place within the glass.

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