Steam
Steam is the name given to water when it is in a gas form. Steam is sometimes thought of as a cloud of translucent mist, however that is only the result of the steam condensing in the air, forming water vapor. Actual hot steam is invisible.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/18/Steam_devil.jpg/250px-Steam_devil.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/48/Grazebrook_Beam_Engine.jpg/250px-Grazebrook_Beam_Engine.jpg)
When the pressure of the atmosphere is 1013 mbar (this is about the average pressure for a place which is at sea level), water will boil (turn into steam) at 100 degrees Celsius. This is the boiling point. Boiling happens in a boiler. 100 degrees Celsius is the same temperature as 212 degrees Fahrenheit, 80 degrees Réaumur and 373.15 Kelvin.
A major use of steam is to power steam engines. A steam engine is a heat engine that performs mechanical work using steam as its working fluid.
Heating food
changeSteam gets sometimes used for heating food. In a pressure cooker, some water turns into steam, and some steam gets released (or let out) thru a valve.
There are other ways to steam food.
Other websites
change- Steam -Citizendium