Boiling Point
A boiling point is the temperature at which a <a href="Liquid">liquid</a> changes state to a <a href="Gas">gas</a>.
The boiling point of water is 100 degrees celcius (C). Boling point is different for every atom for example hydrogen has a boiling point of roughly 20K and gold has a much higher boiling point of almost 3000K. http://www.engineeringtoolbox.com/melting-boiling-temperatures-d_390.html