Question

A barometer is constructed using a liquid (density = 760 kg/m³). What would be the height of the liquid column, when a mercury barometer reads 76 cm?

(density of mercury = 13600 kg/m³)

(1) 0.76 m

(2) 1.36 m

(3) 13.6 m

(4) 136 m

Answer 1

Given,ρl=760 kg/m3


ρHg=13600 kg/m³


hHg=76cm

Since barometer measures atmospheric pressure. So, in both cases, pressure will be the same.

⇒ρL×g×hL=ρHg×g×hH⇒760×hL=13600×76/100 =>h_L=13.6m