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In order to regulate their buoyancy, some fishes are equipped with a swim bladder. Red snapper are a type of fish that has a swim bladder. A snapper swimming at 20 m deep had a pressure of 2 atm pressing on it from the surrounding water. It's swim bladder had a volume of 1 liter. The snapper swam to 45 m deep, and it's swim bladder shrunk to a volume of 0.45 liters. What was the water pressure at 45 m?

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