K - biography
For other uses of "K", see K (disambiguation).Look up K, k in Wiktionary, the free dictionary.Kappa) developed from the Semitic Kap, symbol for an open hand.Latin abandoned the use of K almost completely, preferring C.When Greek words were taken into Latin, the Kappa was converted to C; Latin used K for other languages such as Etruscan, as seen in words such as kalendae, "first day of the month", whence English calendar.Therefore, the Romance languages have K only in words from still other language groups.The Celtic languages also chose C over K, and this influence carried over into Old English.Some English linguists prefer to reverse the Latin transliteration process for proper names in Greek, spelling Hecate as "Hekate", for example.And the writing down of languages that don't have their own alphabet with the Latin one has resulted in a standardization of the letter for this sound, as in Kwakiutl.In Unicode the capital K is codepoint U+004B and the lower case k is U+006B.The ASCII code for capital K is 75 and for lowercase k is 107; or in binary 01001011 and 01101011, correspondingly.The EBCDIC code for capital K is 210, and for lowercase k, 146.Meanings of K
See K (disambiguation).Webster's Third New International Dictionary of the English Language, Unabridged (1993); "kay," op.All text is available under the terms of the GNU Free Documentation License.See Copyrights for details.For other uses, see Kelvin (disambiguation).K) is a unit increment of temperature and is one of the seven SI base units.Definition of kelvin
1.Temperatures and intervals
2.Formatting and typestyle for the K symbol
2.The special Unicode kelvin sign
2.Definition of kelvin
The kelvin unit and its scale, by international agreement, are defined by two points: absolute zero, and the triple point of Vienna Standard Mean Ocean Water (VSMOW).This definition also precisely relates the Kelvin scale to the Celsius scale.The triple point of water is defined as being precisely 273.This definition does three things:
It fixes the magnitude of the kelvin unit as being precisely 1 part in 273.Temperatures in kelvin can be converted to other units per the table at top right.When reference is made to the unit kelvin (either a specific temperature or a temperature interval), kelvin is always spelled with a lowercase k unless it is the first word in a sentence.Before the 13th CGPM, the plural forms were "degrees Kelvin" or "degrees absolute".The 13th CGPM changed the name to simply "kelvin" (symbol K).The omission of "degree" indicates that it is not relative to an arbitrary reference point such as the Celsius and Fahrenheit scales, but rather an absolute unit of measure which can be manipulated algebraically (e.Agar exhibited a melting point hysteresis of 25 kelvins.The uncertainty was 10 millikelvins.Of course, the kelvin is also used to express specific temperatures along its scale (e.One disadvantage of the kelvin is that intervals and specific temperatures on the Kelvin scale use exactly the same symbol (e.The admonition against italicizing the symbol K applies to all SI unit symbols; only symbols for variables and constants (e.As with most other SI unit symbols (angle symbols, e.Its appearance is similar to an ordinary uppercase K.Unicode character may be narrower and slightly taller than a plain uppercase K; precisely the opposite may be true on other platforms.U+004B (uppercase K) and the two would appear identical.In still other computers, the kelvin symbol is mapped incorrectly and produces an odd character.Mixed use of Kelvin and Celsius scales in technical articles
In science and in engineering, the Celsius scale and the kelvin are often used simultaneously in the same article (e.This practice is permissible because the degree Celsius is a special name for the kelvin for use in expressing Celsius temperatures and the magnitude of the degree Celsius is precisely equal to that of the kelvin.Color temperature
The kelvin is often used in the measure of the color temperature of light sources.Color temperature is based upon the principle that a black body radiator emits light whose color depends on the temperature of the radiator.History of the Kelvin scale
Below are some historic milestones in the development of the Kelvin scale and its unit increment, the kelvin.This absolute scale is known today as the Kelvin thermodynamic temperature scale.International des Poids et Mesures (CIPM), a committee of the CGPM, affirmed that for the purposes of delineating the temperature of the triple point of water, the definition of the Kelvin thermodynamic temperature scale would refer to water having an isotopic composition defined as being precisely equal to the nominal specification of VSMOW water.Unit of thermodynamic temperature (kelvin).SI Unit rules and style conventions.National Institute of Standards and Technology (September 2004).SI Brochure, 8th edition Section 5.Bureau International des Poids et Mesures (1967).SI Brochure, 8th edition Section 2.Resolution 3: SI unit of thermodynamic temperature (kelvin).Resolutions of the 13th CGPM.Bureau International des Poids et Mesures (1954).Resolution 4: Definition of the SI unit of thermodynamic temperature (kelvin).Bureau International des Poids et Mesures (1967).Look up Kelvin in
Wiktionary, the free dictionary.International Committee
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