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Why is the latent heat of vaporisation much greater than the latent heat of fusion?

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Question

Why is the latent heat of vaporisation much greater than the latent heat of fusion?

Options

  • Melting completely separates molecules

  • Boiling completely separates molecules and expands against air pressure

  • Melting occurs at a higher temperature

  • Mass changes during melting

MCQ
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Solution

Boiling completely separates molecules and expands against air pressure

Explanation:

Vaporisation requires much more energy because molecules must fully separate and the substance expands against atmospheric pressure.

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