Pressure of Gases

A test tube has a deflated balloon covering it’s open end, so no air can get in or out. The test tube is placed in a beaker of cold water.
This procedure is repeated with an identical test tube sealed with a rubber bung, so that the initial volume of trapped air is the same in both experiments. Compare the pressure in the tube with the bung to the pressure in the tube with the balloon as the water is heated. Explain your reasoning

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