experiment shows how clouds are formed as warm air is cooled. You
will need a large glass jar, a small metal baking tray and some
See the flash animation
a) a glass jar,
b) some hot water; and
c) a metal baking tray with some ice
Pour 2.5 cm of hot water into the jar. (Do
not use boiling water as this may crack the glass.)
Place some ice cubes in the baking tray and put the tray on top
of the jar.
As the air inside the jar rises and is cooled by the ice, the water
vapour it contains condenses into droplets.