In Boyle's experiment, what determines the pressure in the volume of air in the sealed space?

Question

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Boyle's experiment involves measuring the pressure of a gas (air in this case) in a sealed space. The pressure is determined by the excess height of mercury (Hg) between the two columns plus the atmospheric pressure. The excess height of mercury indicates the difference in pressure between the inside of the sealed space and the atmospheric pressure outside, and adding the atmospheric pressure gives the total pressure inside the sealed space.

In Boyle's Experiment, What Determines the Pressure in the Volume