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A mercury barometer in a physics laboratory shows a 732 mm vertical column of mercury. Calculate the atmospheric pressure in pascal.

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A mercury barometer in a physics laboratory shows a 732 mm vertical column of mercury. Calculate the atmospheric pressure in pascal. [Given density of mercury, p = 1.36 × 104 kg m-3 , g = 9.8 ms-2]

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Atmospheric pressure in the laboratory, 

P = hpg = 732 × 10-3 × 1.36 × 104 × 9.8 

= 9.76 × 104 Pa (or) 0.976 × 105 Pa

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