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Pressure

A mercury bar...

Question

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, ρ = 1.36 × 104 kg m–3, g = 9.8 m s–2]

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Solution

Atmospheric pressure in the laboratory,
P = hρg = 732 × 10–3 × 1.36 × 104 × 9.8
= 9.76 × 104 Pa (or) 0.976 × 105 Pa

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