Question

If someone takes a breath and the lungs expand from 4.3 L to 5.5 L in volume, and the initial pressure was 754 mm Hg, what is the pressure (in mm Hg) inside the lungs before any additional air is pulled in?

Answer 1

4.3L to 5.5L

5.5L- 4.3L = 1.2L

initial pressure was 754 mm Hg,

P₁ V₁ = P₂ V₂

(754mmHg)(4.3L) = (P₂)(5.5L)

3242.2 = 5.5 P₂

P₂ = (3242.2/5.5)

P₂ = 589.49mmHg