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easyQ. No. 15156-why-does-steam-at-100-c-cause-more-severe-burns-than-boiling-water-at-100-c

Why does steam at 100°C cause more severe burns than boiling water at 100°C?

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ASteam has higher temperature than water
BSteam contains more latent heat which it releases on condensing
CSteam is lighter and spreads more quickly
DSteam has higher pressure than boiling water
Correct Answer: Steam contains more latent heat which it releases on condensingYour Answer: B

Explanation

This is a very popular question in competitive exams related to latent heat. Option A (Steam has higher temperature than water) is incorrect — both steam and boiling water are at the same temperature: 100°C (at standard atmospheric pressure). There is no temperature difference between them. If the temperature were higher for steam, the question would be trivial and uninteresting. Option B (Steam contains more latent heat which it releases on condensing) is CORRECT — the image states: 100°C की भाप द्वारा उत्पन्न जलन 100°C के पानी की अपेक्षा अधिक गंभीर होती है क्योंकि भाप में गुप्त ऊष्मा अधिक होती है। When steam at 100°C touches the skin, it first condenses to water at 100°C, releasing the latent heat of vaporization (540 cal/g = 2260 J/g). This additional energy is transferred to the skin, causing more severe burns than boiling water at the same temperature. Boiling water only transfers its sensible heat as it cools. Option C (Steam is lighter and spreads more quickly) is incorrect — the spreading of steam has no direct relation to the severity of burns in this context. The physics explanation is entirely based on latent heat. Option D (Steam has higher pressure than boiling water) is incorrect — at 100°C and 1 atm, steam pressure equals atmospheric pressure. Steam in this context is not under

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