# Measuring Pulmonary Capacity

Measuring Pulmonary Capacity

Blowing into a water manometer is a simple way to determine a person's pulmonary capacity. The pressure in the manometer is , where is the density of water, is the gravitational acceleration, and is the difference of the height of the water in the two columns; adding the atmospheric pressure , equal to , gives the total pressure to raise the water column.

P=ρgh

ρ

g

h

p

atm

1.01×Pa

3

10