Explain why, diffusion occurs more quickly in a gas than a liquid.
Diffusion of gases occurs in the alveolar region only and not in the other parts of the respiratory system. Why?
(a) What is meant by 'diffusion'? Give one example of diffusion in gases.
(b) Why do gases diffuse very fast?
(c) Name two gases of air which dissolve in water by diffusion. What is the importance of this process in nature?