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==Radiation and convection==
[[File:Vintage radiator in students laboratory (1904) at Gdansk University of Technology, Poland.jpg|thumb|left|A cast iron convector radiator, central heating system in [[Gdańsk University of Technology]], 1904]]
[[Heat transfer]] from a radiator occurs by all the usual mechanisms: [[thermal radiation]], [[convection]] into flowing air or liquid, and [[Thermal conduction|conduction]] into the air or liquid. A radiator may even transfer heat by [[Phase transition|phase change]], for example, drying a pair of socks. In practice, the term "radiator" refers to any of a number of devices in which a liquid circulates through exposed pipes (often with fins or other means of increasing surface area). The term "[[convector heater|convector]]" refers to a class of devices in which the source of heat is not directly exposed.
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