The question asks why steam at the same temperature as water is a more efficient heating medium. The key concept is latent heat.
Steam at 100°C is more effective in heating than water at the same temperature because
Asked in UPSC CAPF 2011 · Topic: Heat and Thermodynamics (Calorimetry and Phase Changes (Specific Heat, Latent Heat))
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Answer: B. steam has an additional heat known as 'latent heat of vaporization'
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