Cold

Cold refers to the condition or subjective perception of having low temperature, the opposite of hot.

A lower bound to temperature is the absolute zero, defined as 0 K on the Kelvin scale, an absolute thermodynamic temperature scale. This corresponds to −273.15 °C on the Celsius scale, −459.67 °F on the Fahrenheit scale, and 0 °R on the Rankine scale.

Since temperature relates to the thermal energy held by an object or a sample of matter, which is the kinetic energy of the random motion of the particle constituents of matter, an object will have less thermal energy when it is colder and more when it is hotter. If it were possible to cool a system to absolute zero, all motion of the particles in a sample of matter would cease and they would be at complete rest in this classical sense. The object would be described as having zero thermal energy. Microscopically in the description of quantum mechanics, however, matter still has zero-point energy even at absolute zero, because of the uncertainty principle.

Read more about Cold:  Mammalian Perception, Cooling, Notable Cold Locations and Objects, See Also

Other articles related to "cold":

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Thermoreceptor
... thought to be unmyelinated C-fibres (low conduction velocity), while those responding to cold have both C-fibers and thinly myelinated A delta fibers (faster ... For cold receptors their firing rate increases during cooling and decreases during warming ... Some cold receptors also respond with a brief action potential discharge to high temperatures, i.e ...

Famous quotes containing the word cold:

    Is this a holy thing to see
    In a rich and fruitful land,
    Babes reduced to misery,
    Fed with cold and usurous hand?
    William Blake (1757–1827)

    When all is said and done, friendship is the only trustworthy fabric of the affections. So-called love is a delirious inhuman state of mind: when hot it substitutes indulgence for fair play; when cold it is cruel, but friendship is warmth in cold, firm ground in a bog.
    Miles Franklin (1879–1954)

    A man’s social and spiritual discipline must answer to his corporeal. He must lean on a friend who has a hard breast, as he would lie on a hard bed. He must drink cold water for his only beverage. So he must not hear sweetened and colored words, but pure and refreshing truths. He must daily bathe in truth cold as spring water, not warmed by the sympathy of friends.
    Henry David Thoreau (1817–1862)