The units are incompatible, so the answer depends on what you are doing. Pressure is force per unit area, so you would have to multiply by the area the pressure works on to get a force. That force would convert to newtons, in metric, and you would have to divide by the acceleration of local gravity to get the mass in kilograms that exerts that force at local conditions. (Often standard gravity, 9.80665 m/s² is used)

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