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Archive for April 26th, 2017

This came out in ICAS Science this year.

Here is what happened:

By pouring hot water into a jar and trapping it, you created warm, moist air.  As the warm air inside the jar rose, it was then cooled by the ice on top of the jar.

When the water vapour cooled, it wanted to turn back into liquid, but it needed to condense onto a surface. The aerosol provided cloud condensation nuclei: a surface for the water vapour to condense into tiny cloud droplets.

The cloud swirled inside the jar due to the circulation of warm air rising and cold air sinking.

Refer: http://www.kidspot.com.au/things-to-do/activities/how-to-make-a-cloud-in-a-jar for more.

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