Title: Cold - Wikipedia
Headings: Cold
Cold
Contents
Cooling
History
Early history
From the 17th century
19th century
20th century
Physiological effects
Notable cold locations and objects
Mythology and culture
See also
References
Bibliography
External links

Content: Contents
1 Cooling
2 History
2.1 Early history
2.2 From the 17th century
2.3 19th century
2.4 20th century
3 Physiological effects
4 Notable cold locations and objects
5 Mythology and culture
6 See also
7 References
8 External links
Cooling
Main article: Refrigeration
Cooling refers to the process of becoming cold, or lowering in temperature. This could be accomplished by removing heat from a system, or exposing the system to an environment with a lower temperature. Coolants are fluids used to cool objects, prevent freezing and prevent erosion in machines. Air cooling is the process of cooling an object by exposing it to air. This will only work if the air is at a lower temperature than the object, and the process can be enhanced by increasing the surface area, increasing the coolant flow rate, or decreasing the mass of the object. Another common method of cooling is exposing an object to ice, dry ice, or liquid nitrogen. This works by conduction; the heat is transferred from the relatively warm object to the relatively cold coolant. Laser cooling and magnetic evaporative cooling are techniques used to reach very low temperatures.