This question has two parts. Use the information to answer Part A and Part B.

Question

Students conduct an experiment to understand how clouds form.
Cloud in a Bottle Experiment
1. Pour 30 mL of warm water into a 2 L plastic bottle.
2. Light a match. Blow it out and drop it in the bottle.
3. Screw the lid on the bottle.
4. Squeeze the sides of the bottle and release. Repeat while observing.
The students observe a cloud forming and disappearing as they squeeze and release the bottle.
Part A
When does the cloud form?
A. when students release the bottle
B. when students squeeze the bottle
Part B
Why does this action result in water molecules condensing into a cloud? Select one choice from each set to answer the question.
The air pressure [increased / decreased ], which caused the temperature to [increase / decrease ].

Answer 1

Part A
A. when students release the bottle

Part B
The air pressure decreased, which caused the temperature to decrease.