# Toricelli’s barom

In Toricelli's barometer mercury is used

Density of mercury (ρ1) = 13.6 × 103 kg/m3

Height of mercury column at atmospheric pressure (h1) = 0.76 m

Density of French wine (ρ2) = 984 kg/m3

Height of the French wine column at atmospheric pressure = h2

We know that pressure in a column of height h and density ρ = ρgh

where, g = acceleration due to gravity = 9.8 m/s2

Pressure in both the columns is the same i.e. atmospheric pressure

ρ1gh1 = ρ2gh2

ρ1h1 = ρ2h2

(13.6 × 103) × 0.76 = (984) × h2

h2 = 10.504 m

Hence the height of French white column at normal atmospheric pressure is 10.504 m.

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