Water is _________ times viscous than air?
Correct answer: A. 50
- A. 50
- B. 1000
- C. 5000
- D. 8000
Explanation
At ordinary temperature, water is approximately 50 times more viscous than air, so gases diffuse much more readily through air than through water. Students may choose 1000 because water feels much thicker than air, but viscosity is a measured physical ratio rather than a comparison based on sensation.
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About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
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