Question

what is the height of mercury which exers the same pressure as 20 cm of water column. Take a density of mercury as 13.6g+cc

Answer 1

Pressure = hdg

Pressure due to water column = Pressure due to mercury column
h₁d₁g = h₂d₂g

h₂ = (h₁d₁ / d₂)
= (20 cm × 1 g/cm³) / 13.6 g/cm³
= 1.470 cm

Height of mercury column is 1.470 cm

Answer 2

Pressure = height of *density * g.

Here, Given pressure of water = pressure mercury.

So hdg of water = (hdg) of mercury

h1 d1 = h2 d2

20*1 = h2 13.6

20/13.6 = h2

h2 =1.47 cm

The height of mercury which exers the same pressure as 20 cm of water column is 1.47 cm