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"Does Air Have Weight?" Water and Air PPT Courseware 3
Take a guess
There is something everywhere that cannot be driven away with a stick;
Can't see with eyes, can't touch with hands,
It has no taste when chewed, and you will not live long without it.
(Hit a natural phenomenon)
1. Students, guess whether air has weight?
2. Let’s design an experiment to explore whether air has weight?
3. Experimental materials
Small wooden sticks, balloons, string, pen caps (chalk)
Kind tips:
1. Work in groups to complete the experiment and keep the classroom quiet.
2. What should you pay attention to when doing this experiment?
Answer: The position of the string on the small wooden stick cannot be changed.
3. Analyze the phenomenon and draw conclusions.
experimental method:
1. Inflate the balloon and tie it tightly and hang it on one end of the small wooden stick.
2. Hang the chalk (pen cap) on the other end.
3. Tie a string in the middle to adjust it to make it balanced, and then mark it on the small wooden stick.
4. Lift the small wooden stick again and observe whether it is still in a balanced state. If it is not balanced, readjust it to the balanced state and mark it until it is still balanced after being lifted.
Class summary
1. What did the students know through this lesson?
2. We must develop good habits of careful observation and active exploration.
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