Article about boiling point, it provides the definition and how and when it occurs. Contents of this articles are: Saturation temperature and pressure; Relation between the normal boiling point and the vapor pressure of liquids and; Properties of the elements.
3min 40sec lecture video about the boiling point. It is the particular temperature where vapor pressure equals to of a liquid equals to the surrounding environmental liquid. At this temperature the liquid begins to bubble as liquid below the surface turns to gas and escapes upwards.
1min 58sec classroom demonstration of the effects of lowering the air pressure on the boiling point of water.
Article about the boiling point of a liquid. It also provides some links related to the topic.