A vessel contains methane and oxygen in the mass ratio of `2 : 1` .The fraction of partial pressure of oxygen in the total pressure is

Partial pressure of oxygen in the lungs is .

the partial pressure of oxygen in the alveolar air is

The partial pressure of oxygen in the alveoli of the lungs is

what is partial pressure of oxygen in systemic vein?

A gas mixture contains oxygen and nitrogen in 1 : 2 mole ratio . Ratio of the partial pressures of nitrogen and oxygen in the mixture is

Partial pressure for oxygen and CO_(2) is represented as