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 Form 1 Physics Exam Questions and Answers on Pressure

The figure below shows some air trapped in a glass tube, the tube is inverted in a dish containing mercury. Given that the atmospheric pressure is 760 mmHg and the pressure due to the mercury column in the glass is 550 mmHg determine the pressure of the air trapped in the tube in mmHg.

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Answer Text:
Pair +pmer = patm
Pair= patm – pmer
=760 – 550
=210 mmHg