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Chem Chemistry

ChemistryNEB 2076 (old course)

Differentiate between evaporation and boiling. [2]

2

Answer

· Based on the official syllabus and past papers
Updated 
| **Feature**       | **Evaporation**                                                                 | **Boiling**                                                                 |
|-------------------|-------------------------------------------------------------------------------|-----------------------------------------------------------------------------|
| **Definition**    | Loss of liquid molecules from the surface into the vapour phase at any temperature. | Rapid conversion of liquid into vapour throughout the bulk of the liquid at a fixed temperature. |
| **Temperature**   | Occurs at all temperatures below the boiling point.                          | Occurs only at the boiling point of the liquid.                            |
| **Surface Effect**| Only surface molecules escape.                                               | Entire liquid converts into vapour.                                        |
| **Energy Requirement** | Requires less energy; endothermic but slower.                              | Requires more energy; rapid and vigorous.                                  |
| **Bubble Formation** | No bubbles formed.                                                           | Bubbles of vapour form throughout the liquid.                              |
| **Example**       | Drying of clothes, water from a puddle.                                      | Water boiling in a kettle, cooking rice.                                    |

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