A barometer is constructed using a liquid (density = 760kg m ^ - 3...

Recall the formula of liquid pressure due to column in terms of density of the liquid, the height of the liquid column, and the& acceleration due to gravity,& $P = hρg$

$⇒ 76cm \times {ρ}_{Hg} \times g = h \times {ρ}_{L} \times g$

$⇒ h = 76cm \times \dfrac{ρHg}{ρL}= 76cm \times \dfrac{13600}{760}= 13 . 6m$.