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Set-up A
We know that water rose up the glass tube in set-up A. This means that the air in the flask (and glass tube) now takes up less space, allowing for the water to enter. Therefore, we can deduce that the cloth must be cold enough to cause the air within the flask to contract, taking up less space, and allowing for some water to rise up the glass tube.

Set-up B
We know that there were bubbles observed in the water in the container. This means that the air in the flask must have escaped through the glass tube and into the water. Therefore, we can deduce that the cloth must be hot enough to cause the air within the flask to contract and take up more space, leading to some of the air escaping.

Set-up C
We know that no changes were observed. This means that the volume of air within the flask (and glass tube) remained the same. Therefore, we can deduce that the cloth must be at room temperature so it doesn’t heat up or cool the air within the flask, making them expand or contract respectively.

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