To prepare for the experiment, follow these steps: 1. Put one or two ice cubes in 1 cup of water. Chill the cup of water in the refrigerator for 1 to 2 hours. Remove
any remaining ice when you take the water out of the refrigerator. This cup holds the ice-cold water
2. Heat up three cups of water in the microwave for 15 to 20 seconds until they reach 100°F on the
thermometer. If you heat the water too much, wait until the temperature drops to 100°F. These cups hold
the lukewarm water.
3. Heat the last cup of water in the microwave until it reaches 212°F. This cup holds the boiling water.
Now line up the five glasses and label them A, B, C, D, and E. Then put the following contents in each glass:
Glass
A
B
Contents
1 cup lukewarm water
1 cup lukewarm water and 1 tablespoon sugar
1 cup boiling water and 1 tablespoon sugar
1 cup ice-cold water and 1 tablespoon sugar
1 cup lukewarm water and 1 tablespoon sugar (this one will be covered with plastic wrap)
C С
D
E
Use the spoon to stir the contents in glasses B, C, D, and E until the sugar dissolves. Then immediately add a
packet of yeast to each glass. Wash the spoon and stir in the yeast. Cover the top of glass E tightly with plastic
wrap.
Wait 15 minutes. Then measure the foam level in each glass in centimeters, as shown in the image.
2
foam