A diving bell is a $4\mathrm{.}4$ mm $-$tall cylinder closed at the upper end but open at the lower end. The temperature of the air in the bell is $20$C$$C$.$ The bell is lowered into the ocean until its lower end is $100$ mm deep. The temperature at that depth is $10$C$$C$.$

Part A

How high does the water rise in the bell after enough time has passed for the air to reach thermal equilibrium?

Express your answer with the appropriate units.

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Part B

A compressed$-$air hose from the surface is used to expel all $$the water from the bell. What minimum air pressure is $$needed to do this?

Express your answer with the appropriate units.

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