Question

The basic barometer can be used to measure the height of a building. If the barometric readings at the top and at the bottom of a building are 730 and 755 mmHg, respectively, determine the height of the building. Assume an average air density of 1.18 kg/m^3.

Answer 1

h = 287.1 m

Step-by-step explanation:

the density of mercury \rho =13570 kg/m3

the atmospheric pressure at the top of the building is

`p_t = \rho gh  = 13570*908*0.73 = 97.08 kPa`

the atmospheric pressure at bottom

`p_b = \rho gh  = 13570*908*0.75 = 100.4 kPa`

`(w_(air))/(A) =p_b -p_t`

we have also

`(\rho gh)_(air) = p_b - p_t`

1.18*9.81*h = (100.4 -97.08)*10^3

h = 287.1 m