A thin tube of uniform cross section is sealed at both ends. It lies horizontally, the middle 5 cm containing mercury and the two equal ends containing air at the same pressure "P". When tube is held at an angle 60° with the vertical direction, the length of the air column above and below the mercury column are 46 cm and 44.5 cm respectively. What is the value of P in cm of mercury?(Temperature of system is kept at 30°C
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