Question

# A closed container is partially filled with water. Initially, theair above the water is at atmospheric pressure (1.01\times10^5\ Pa) and the gauge pressure at the bottom of the wateris 2500 Pa. Then additional air is pumped in, increasing thepressure of the air above the water by 1500 Pa.

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A closed container is partially filled with water. Initially, theair above the water is at atmospheric pressure $$\displaystyle{\left({1.01}\times{10}^{{5}}\ {P}{a}\right)}$$ and the gauge pressure at the bottom of the wateris 2500 Pa. Then additional air is pumped in, increasing thepressure of the air above the water by 1500 Pa.