《The world of science》PPT课件(第3课时)

外研版高中英语必修三《The world of science》PPT课件(第3课时)，共14页。

Goals

1. Read an experiment report and understand the structure of an   experiment report.

2. Practise an experiment report with the help of the given structure.

3. Improve your own ability of writing

Read the instructions(on page 35) for the experiment and answer the questions.

1. What will the results of this experiment be?

After the egg is sucked into the mouth of the bottle, it is slowly absorbed into the bottle and falls to the bottom.

2. What can you learn from this experiment?

Through my own experience, I have learned that as long as we study hard, observe and think carefully, we can figure out the secret of some scientific facts.

Writing help

How to write an experiment report:

①.Introduction:Introduce the aim of the experiment.

②.Main body:Describe the materials used in the experiment and explain the procedure.

③.Conclusion:Report the results and what you have learnt.

Discussion

Why does the egg get pushed inside the bottle?

The answer is all about air pressure. If you first set the egg on an empty bottle, the air pressure inside the bottle matches the air pressure outside, so nothing happens. But when you pour some hot water into the bottle, it causes the air inside to heat up and expand rapidly, so some of the air in the bottle gets out. When the egg is put on the bottle, the air pressure outside of the bottle pushes the egg into the bottle. The result is an unbalanced force – the force of the air pushing on the egg from outside the bottle is greater than the force of the air pushing up on it from inside the bottle. As a result, the egg is pushed into the bottle.

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