Measuring Pulmonary Capacity

h

0.343

Blowing into a water manometer is a simple way to determine a person's pulmonary capacity. The pressure in the manometer is

P=ρgh

, where

ρ

is the density of water,

g

is the gravitational acceleration, and

h

is the difference of the height of the water in the two columns; adding the atmospheric pressure

p

atm

, equal to

1.01×

3

10

Pa

, gives the total pressure to raise the water column.