vyscW3Volume change of water and of Cola during solidification
In the first experiment you have measured the volume of water a high ampoule can take without overflowing. Most of Cola is water. So it might have a similar behaviour during freezing (= solidification).

Material
Tray, 2 high ampoules (5 ml), a broad ampoule (5 ml), 2 stoppers of infusion bottles, toilette paper, 2 dropper bottles for water and stale Cola.
yExperiment
1. Use the stoppers of the infusion bottles as stands for the 2 high ampoules.
2. Place them into the tray.
3. Transfer as much water as possible into one ampoule (Photo 1) and the same volume of stale Cola into the second one (Photo 3).
5. Keep the tray with the ampoules in a freezer.
Observations
Compare your results with those in photos 2 and 4.
Explanation
The density of a substance is calculated by dividing its mass through its volumen (masse/volume). The masses of water did not change, their volumes increased (photos 2 and 4). This means that their density decreases during solidification.
Additional activity 
Break off the "Microscale icebergs" and place them into the broad ampoule full of water.

Supercooled water http://www.youtube.com/watch?v=JeQQEmj1T_o

back....... go on ...............first publication 11.09.2001.........................................last modification: 21.12.2008