A gloomy smog in a jar

This experiment creates an artificially fog in a jar.

It demonstrates that fog forms like clouds when water vapour condenses in the air in contact with cold. For fog to form, small particles must also be present in the air so that water droplets can 'stick' to them.

To make the experiment even more fun, we propose to create a gloomy landscape with a haunted castle surrounded by fog.

This DIY was developed for the magazine 'Campus Junior' of the University of Geneva.

Draw, then cut out the silhouette of a haunted castle in a drink box.Cover the silhouette in black with marker pen. With the black marker, decorate the outside of the jar with bats and quirky trees.Add a small amount of very hot tap water (<1cm), then close the lid and stir the jar until it is uniformly warm. Place the castle in the jar.Put the lid upside down on the jar and add some ice cubes on top. Place a lit candle behind ...Light up a match, then extinguish it and immediately throw it into the jar. Replace the lid and observe how the fog ...

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Date	19.08.2025
Author	webmaster
Organization	webenergie
Translator	webmaster

Final purpose	Others
Field	Astronomy, Weather, Geography Chemistry

Language	français english
Licence