Page 41 - 新思维科学学生用书9 样章

1 Photosynthesis and the carbon cycle

Think like a scientist

How do rising temperatures affect sea level?

In this experiment, you will investigate how rising temperatures can affect sea level.
Experiment 1

You will need:
• two large measuring cylinders, a funnel big enough to hold 10 ice cubes,
20 ice cubes all the same size.

Method
1 Put 10 ice cubes into one of the measuring cylinders. Add water so that the

cylinder is about three quarters full. Record this level.
2 Add water to the second measuring cylinder to exactly the same level as in the first
one.

3 Place the funnel in the second measuring cylinder. Put 10 ice cubes into the funnel.
4 Leave both cylinders at room temperature, until the ice melts.
5 When the ice has melted, record the new levels in both measuring cylinders.
Experiment 2

You will need:

• the apparatus shown in the
diagram – make sure that the water is ruler or graph
really cold, a lamp. paper fixed
glass tubing
next to the
Method glass tubing
1 Read the temperature on the
thermometer, and the level of the thermometer

water in the glass tubing. Record them 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
in a results chart. meniscus
2 Place a lamp close to the conical flask
and switch it on. The lamp will gently

warm the water in the flask. conical flask
completely full
3 Approximately every five minutes (the of cold, coloured
exact timing does not matter), record water
the temperature and the level of the

water in the glass tubing. Keep going cm
until you have at least 10 readings.

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