"केल्विन": अवतरणों में अंतर

Until the 13th [[General Conference on Weights and Measures]] (CGPM) in 1967–1968, the unit kelvin was called a "degree", the same as with the other temperature scales at the time. It was distinguished from the other scales with either the adjective suffix "Kelvin" ("degree Kelvin") or with "absolute" ("degree absolute") and its symbol was °K. Note that the latter (degree absolute), which was the unit’s official name from 1948 until 1954, was rather ambiguous since it could also be interpreted as referring to the [[Rankine scale]]. Before the 13th CGPM, the plural forms were "degrees Kelvin" or "degrees absolute". The 13th CGPM changed the name to simply "kelvin" (symbol K).<ref>{{cite paper | author=Barry N. Taylor | title=Guide for the Use of the International System of Units (SI) | version=Special Publication 811 | format=.PDF | publisher=National Institute of Standards and Technology | url=http://physics.nist.gov/cuu/pdf/sp811.pdf | date=1995 | accessdate=2008-02-06}}</ref> 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.g. multiply by two to indicate twice the amount of heat). -->

 

 

One disadvantage of the kelvin is that intervals ''and'' specific temperatures on the Kelvin scale use exactly the same symbol (e.g., “Agar exhibited a melting point hysteresis of 25 K,” and “The triple point of hydrogen is 13.8033 K”). -->