Cornelsen Experimenta 31799, Experiment Description/Manual, Page: 10 / 16

Heat
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1.11 Experiment 11 (Demonstration)
What happens when steam cools down?
Fill a heat-resistant beaker with water and bring the water to the boiling-
point with an immersion heater. Now hold the plastic container filled with
ice cubes over the steam.
The water boils. Numerous particles escape from the water, some of which
rise as gas bubbles (steam).
The steam becomes mist (clouds) in the cooler air as the particles become
more densely packed.
Drops form on the cool base of the container. They condense.
Materials: 1 immersion heater (13)
1 heat-resistant beaker (16)
1 plastic container (17)
Additionally: 1 thermos flask with ice cubes
1.12 Experiment 12
The water cycle
Water evaporates everywhere: Invisible water particles rise from the sea, from
fields and forests. These evaporated water particles condense where the air
is colder and form (mist) clouds.
When the air becomes even colder or the wind moves these clouds to cooler
regions, the mist particles unite to form larger drops which, because of their
weight, fall downwards: It rains.
The water cycle is complete. The rain evaporates, the invisible particles
rise etc.