A K is exactly 1 / 273.16 of the thermodynamic temperature of the triple point of water. Par accord international, une valeur de 273,16 K (0,01 ° C; 32,02 ° F) et une pression de vapeur partielle de 611,66 pascals (6,166 mbar; 0,0060366 atm) ont été attribués au triple point d’eau . Its lower fixed point is absolute zero. Definition of Kelvin. The Kelvin temperature scale was the brainchild of Belfast-born British inventor and scientist William Thomson — also known as Lord Kelvin. At 0K there is no movement at the molecular level. One kelvin is formally defined as 1/273.16 (3.6609 x 10 -3 ) of the thermodynamic temperature of the triple point of pure water (H 2 O). See for yourself what each of the most common light temperatures looks like on camera with this simple breakdown of the Kelvin scale. Colour temperature is a characteristic of visible light that has important applications in lighting, photography, videography, publishing, manufacturing, astrophysics, and other fields. It is measured in degrees on a Kelvin scale (K) and typically ranges from 2700 – 5000 degrees Kelvin. Kelvin definition, English physicist and mathematician. See more. The kelvin is now defined by fixing the numerical value of the Boltzmann constant k to 1.380 649×10 −23 J⋅K −1.This unit is equal to kg⋅m 2 ⋅s −2 ⋅K −1, where the kilogram, metre and second are defined in terms of the Planck constant, the speed of light, and the duration of the caesium-133 ground-state hyperfine transition respectively. The size of the unit, the kelvin, is the same as the degree Celsius, and the triple point of water is 273.16 K. Le kelvin est défini comme la fraction 1⁄273,16 de la température thermodynamique du point triple de l’eau. The kelvin (K) — the SI unit of temperature — now has a radically new definition. [ K = C + 273.16°, F = (9/5)C + 32°]. The thermodynamic temperature kelvin Kelvin (old degree Kelvin) is defined based on 2 factors, Zero corresponds to absolute zero, which is the lowest temperature that can be achieved. Kelvin Scale - Kelvin scale is a temperature scale that has no negative values. kelvin (K): The kelvin (abbreviation K), less commonly called the degree Kelvin (symbol, o K), is the Standard International ( SI ) unit of thermodynamic temperature. Kelvin is a temperature scale designed so that zero degrees K is defined as absolute zero (at absolute zero, a hypothetical temperature, all molecular movement stops - all actual temperatures are above absolute zero) and the size of one unit is the same as the size of one degree Celsius. This change in definition acknowledges that temperature is fundamentally a measure of the average energy of molecular motion. Colour temperature is conventionally stated in the unit of absolute temperature, the kelvin (K). 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