Question

1 atm is equal to: A. 1 mmHg B. 14.7 mmHg C. 76 mmHg D. 760 mmHg

Answer 1

Answer : the correct answer is D.

Explanation :

As per the question, the pressure is given as 1 atm.

We know that atmospheric pressure is,

$P=\rho gh$

where, $\rho$ is the density of mercury.

g is the acceleration due to gravity.

h is the height of mercury column.

The pressure is said to be 1 atm if the mercury column corresponds to 76 Cm at STP.

This can be written as 76 Cm of Hg.

we know, 1 Cm = 10 mm

Hence, 76 Cm = 76 × 10 mmHg = 760 mmHg

Answer 2

1 atm =  760 mmHg

Answer D

hope this helps!