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That's because it requires a lot of energy to convert the liquid to the vapor phase - even for just converting (for example) water at 100 °C to water vapor that is also at 100 °C.

So, for example, once the water is at the boiling point (around 100 °C, depending on the exact air pressure), you need to add A LOT of heat to convert all the water to water vapor; in fact, much more than you needed to heat the water up to 100 °C.

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Related Questions

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