Verified Solution • 2025–26 Session moderate

QPages 34-37: Q52: HC Verma: Concepts of Physics - Volume 2 Kinetic Theory of Gases Pages 34-37: Q52 Solution: The human body has an average temperature of 98�F. Assume that…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often think the required ambient pressure is the sum of normal atmospheric pressure and the liquid’s vapor pressure, but boiling occurs when the ambient pressure drops to *equal* the saturation vapor pressure. The minimum pressure to keep blood from boiling is just above its vapor pressure (~6.3 kPa at 37 °C), not the usual 101 kPa plus that value.

The human body has an average temperature of 98�F. Assume that the vapour pressure of the blood in the veins behaves like that of pure water. Find the minimum atmospheric pressure which is necessary to prevent the blood from boiling. Use figure for the vapour pressures.

Step-by-Step Verified Solution

**Answer:** Minimum pressure = 6.3 kPa **Step-by-Step Explanation:** Average body temperature = 98�F = 98−321.8=36.7�C≈37�C\frac{98-32}{1.8} = 36.7�\text{C} \approx 37�\text{C}. From the vapour pressure curve of water, the saturation vapour pressure at 37�C is approximately **6.3 kPa**. To prevent the blood from boiling, the atmospheric pressure must be at least this value.

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