Question

2
The diagram shows air trapped in a flask by a small volume of water in a thin tube.

When the flask is held in a student's hands, the small volume of water first moves down from P to
Q, and then up to R.
Why does the small volume of water move like this?
A
The flask contracts and then the air expands.
B
The flask expands and then the air contracts.
The flask expands and then the air expands less than the flask.
The flask expands and then the air expands more than the flask.
D​

Answer 1

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