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kgm^_3)
Atmospheric pressure = (density of mercury x g x (length of mercury column - length of air column)) / (length of air column)
Atmospheric pressure = (1.36 x 10^4 x 10 x (8.5 x 10^2 - 5.0 x 10^2)) / (5.0 x 10^2)
Atmospheric pressure = 1.05 x 10^5 Pa