Question

A barometer is constructed using a liquid (density $= 760 \,kg/m^{3})$ What would be the height of the liquid column, when a mercury barometer reads $76\, cm$ ?
(density of mercury $= 13600 kg/m^{3})$

• A. $1.36 \,m$
• B. $13.6\, m$
• C. $136 \,m$
• D. $0.76\, m$

Answer 1

Answer: (B)

$76\,cm \times\rho_{Hg} \times g=h\times\rho_{L}\times g$
$h=76 cm\times\frac{\rho_{Hg}}{\rho_{L}}$
$=76\,cm\times\frac{13600}{760}$
$=13.6\,m$