Question

Which of the following is equal to 1 atm pressure?
(A) pressure exerted by a water column of length 760 mm.
(B) pressure exerted by a bromine column of length 760 mm.
(C) pressure exerted by an alcohol column of length 760 mm.
(D) pressure exerted by a mercury column of length 76 cm.​

Answer 1

Dear Student,

● Answer -

(D) pressure exerted by a mercury column of length 76 cm

● Explanation -

It's a well-known fact that 1 atm = 101325 Pa

We can derive this from,

P = ρhg

101325 = 13560 × h × 9.8

h = 101325 / (13560 × 9.8)

h = 0.76 m

h = 76 cm

Hence, pressure exerted by a mercury column of length 76 cm is 1 atm.

Thanks dear. Hope this helps you...