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":

Thermoreceptor
... velocity), while those responding to cold have both C-fibers and thinly myelinated A delta fibers (faster conduction velocity) ... 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 ...
Hibiscus Rosa-sinensis - Genetics
... Hibiscus rosa-sinensis has been successfully hybridized with the cold-hardy Hibiscus moscheutos and several other North American Hibiscus species, producing cold-hardy ... tropical plants worldwide, including indoors in cold climates ...
Norwegian Rocket Incident - Background
... The Norwegian rocket incident was a few minutes of post-Cold War nuclear tension that took place nearly four years after the end of the Cold War ... The 1995 incident occurred in the post-Cold War era, where many Russians were very suspicious of the United States and NATO ...
Sinaloa - Geography and Environment
... side, moderately warm in the valleys and foothills, moderately cold in the lower mountains and cold in the higher elevations ... Its weather characteristics vary from subtropical, found on the plains, to cold in the nearby mountains ...
Crankset - Parts - Cranks - Materials
... Aluminum cranks may be cast, hot forged or cold forged ("cold" in this context means the billet from which the crank is to be made is heated to a specified temperature well below the ... Cold forging gives the metal additional strength, and the cranks can therefore be made lighter without increasing the risk of breakage ...

Famous quotes containing the word cold:

    How cold the vacancy
    When the phantoms are gone and the shaken realist
    First sees reality. The mortal no
    Has its emptiness and tragic expirations.
    Wallace Stevens (1879–1955)

    O Captain! my Captain! our fearful trip is done,
    The ship has weather’d every rack, the prize we sought is won,
    The port is near, the bells I hear, the people all exulting,
    While follow eyes the steady keel, the vessel grim and daring;
    But O heart! heart! heart!
    O the bleeding drops of red,
    Where on the deck my Captain lies,
    Fallen cold and dead.
    Walt Whitman (1819–1892)

    The poppy that my heart was,
    formed to bind all mortals,
    made to strike and gather hearts
    like flame upon an altar,
    fades and shrinks, a red leaf
    drenched and torn in the cold rain.
    Hilda Doolittle (1886–1961)