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The heat energy absorbed at constant temperature by unit mass of a solid to convert it into the liquid phase is called the:
Aspecific latent heat of vaporisation
Bspecific heat capacity
Cspecific latent heat of fusion
Dabsolute humidity
Answer & Solution
Correct answer: C. specific latent heat of fusion
1. During solid to liquid change, temperature stays constant while heat is absorbed.
2. This heat per unit mass is the specific latent heat of fusion.
3. The latent heat of vaporisation refers to liquid to gas, so it is ruled out.
4. Specific heat capacity involves a temperature rise, not a phase change at constant temperature.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 5 "Heat", p.72_
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