1. Take a half filled water bottle. Insert a straw in it and seal the mouth of the
bottle tightly with clay. The straw should reach inside water.
A. Predict what would happen if you were to blow hard into the bottle.
Now blow hard into the bottle, using the straw, and move away immediately.
B. What did you observe? Why did it happen?
2. Take a plastic bottle and pour hot water into it. Drain the water from the bottle
immediately and replace the cap of the bottle.
A. Predict what would happen if you were to replace the bottle in a tub of cold water.
Now place the bottle in a tub of cold water.
B. What did you observe? Why did it happen?
3. Take an empty bottle and a tub containing water.
A. Predict what would happen if you try to push the bottle into the tub as shown in
the figure.
Now push the bottle in the tub of water.
B. What did you observe? Why did it happen?
C. What should you do to release some air from the bottle?
4. What do you conclude from these experiments?
Answers
Answer:
1.
A) The water in the bottle would come out.
B) The water in the bottle came out forcefully through the straw. The air blown takes space and pushes the water out.
2.
A) The bottle's shape will be distorted.
B) The bottle collapsed. The hot air inside contracts and the air outside easily exerts pressure on the bottle.
3.
A) The bottle would push out and try to come out.
B) The bottle repelled from the water and no water got filled.
C) We should tilt it.
4. We can conclude from these experiments that air exerts pressure.
Answer:
Answer:
1.
A) The water in the bottle would come out.
B) The water in the bottle came out forcefully through the straw. The air blown takes space and pushes the water out.
2.
A) The bottle's shape will be distorted.
B) The bottle collapsed. The hot air inside contracts and the air outside easily exerts pressure on the bottle.
3.
A) The bottle would push out and try to come out.
B) The bottle repelled from the water and no water got filled.
C) We should tilt it.
4. We can conclude from these experiments that air exerts pressure.
Explanation:
no explanation