Question

a mercury barometer in a room at 25 c has a height of 750mm what is the atmospheric pressure in kpa

Answer 1

Solution:

Density of Mercury at 25°C = 13.534 kg/m³

$P_{atm} = \rho g H_{0}$

$P_{atm} = Atmospheric \ Pressure = To \ find\\\rho = Density = 13.534 \\g = Acceleration \ due \ to \ gravity = 9.80665\\H_{0} = Height = 750 mm = \frac{750}{1000} = 0.75 m$

$P_{atm} = \rho g H_{0}$

$P_{atm} = 13.534 * 9.80665 *0.75$

$P_{atm} = 99.54 \ kPa$

The atmospheric pressure is 99.54 kPa