JAMB Physics 2025 Objective — Question 18

Question 18 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2025 Objective paper, with the correct answer and a full explanation.

Steam at 100°C causes a more severe burn than water at 100°C because:

A. it depends on relative humidity
B. steam contains more latent heat per unit massCorrect
C. steam is at higher pressure
D. steam has higher thermal conductivity

Explanation

Steam releases additional latent heat of vaporisation (~2260 kJ/kg) when it condenses on skin.

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