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[[File:Antarctic_iceberg,_2001_-2.jpg|Antarctic iceberg, 2001 -2|thumb]] [[File:Diving_signal_cold.jpg|Diving signal cold|thumb|left]] [[File:Goose_bumps.jpg|Goose bumps|thumb|left]] [[File:AntarcticaDomeCSnow.jpg|AntarcticaDomeCSnow|thumb]] [[File:Léon_Perrault,_1890_-_Out_in_the_Cold.jpg|Léon Perrault, 1890 - Out in the Cold|thumb]] '''Cold''' refers to a low temperature environment or the sensation experienced when exposed to such conditions. It is also commonly used to describe a viral infection known as the [[common cold]], which affects the upper respiratory tract. This article will focus on both the physical and medical aspects of cold.

==Physical Aspect==
In terms of physical science, cold is the absence of [[heat]], a condition where the environment has a lower temperature. Temperature is a physical quantity expressing the subjective perceptions of hot and cold. Temperature measurements are utilized in various fields, including [[meteorology]], [[medicine]], and [[engineering]], to describe the thermal state of a system.

===Effects on Matter===
Cold temperatures can have significant effects on the state of matter. For example, reducing the temperature of a liquid can turn it into a solid, as seen when water freezes into [[ice]]. This process is crucial in various natural and industrial processes, such as the formation of snow and the manufacturing of ice cream.

==Medical Aspect==
The term "cold" is often used colloquially to refer to the [[common cold]], a viral infectious disease primarily caused by [[rhinoviruses]]. This illness is characterized by symptoms such as [[sneezing]], [[coughing]], [[sore throat]], and [[runny nose]]. The common cold is a self-limiting condition, meaning it typically resolves without the need for medical treatment.

===Transmission===
The common cold is highly contagious and can be transmitted through airborne droplets when an infected person coughs or sneezes, or through direct contact with contaminated surfaces. It is one of the most frequent infectious diseases in humans, with millions of cases occurring worldwide every year.

===Prevention and Treatment===
Preventative measures include frequent hand washing, avoiding close contact with people who are sick, and maintaining a healthy immune system through proper diet and exercise. Treatment focuses on relieving symptoms, as there is no cure for the common cold. Over-the-counter medications, such as [[antihistamines]], [[decongestants]], and [[pain relievers]], can help manage symptoms.

==Cultural and Social Aspects==
The concept of cold has played a significant role in culture and society. Cold weather, for instance, has influenced human settlement patterns, clothing, and activities. Cultures in colder climates have developed unique architectural styles to retain heat, as well as clothing designed to insulate against the cold.

==See Also==
* [[Heat]]
* [[Temperature]]
* [[Influenza]]
* [[Weather]]

[[Category:Physics]]
[[Category:Medicine]]
[[Category:Meteorology]]

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Cold - Revision history

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