Candle under glass experiment

Numéro d’image : 13619162
Candle under glass experiment
Candle under glass experiment. A classic experiment shows that when an inverted glass is placed over a burning candle in a plate of water, the water level rises as the candle burns out. Initially, as the candle burns, the combustion of hydrocarbons consumes more gas molecules than it produces. Therefore the volume of the gas decreases due to the chemical reaction. As oxygen is used up, the flame dies, but the water continues to rise. This is because the air that has been heated up by the candle starts to cool down and thus reduces in volume. Further, some water vapor produced in the reaction condenses to liquid, leading to an additional decrease of gas volume trapped under the glass.
Licence : Droits gérés
Crédit: Science Photo Library / Turtle Rock Scientific
Taille de l’image : 6884 px × 3400 px
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