evaporation and boiling

Evaporation:
Occurs at any temperature
Occurs at the surface of the liquid
No bubbles formed

Boiling:
Occurs at a definite temperature --- the boiling point
Occurs within liquid
Bubbles appear

2006-11-13 21:17:22 補充：
Example of evaporation:Wet clothes and puddles of water dry in air because of evaporation.Example of boiling:When the water has been heated to 100°C, it boils and become the water vapour.

以一大氣壓力之下的水作為例子

任何溫度之下液態水化為蒸氣都可稱為蒸發---evaporation 。

在100oC時，液態水中的任何地方都同時發生氣化的變化，稱為沸騰---boiling。