Kelvin scale

A thermodynamic temperature scale starting from a theoretical minimum value, known as absolute zero, marking the total absence of energy and, consequently, of motion (zero molecular agitation). The unit of temperature on this scale is the kelvin (K), which is one of the base units of the International System. It is named in honor of the British physicist and mathematician William Thomson (1824-1907), known as Lord Kelvin, thanks to his noble title. In 1848, he suggested it was necessary to have an absolute thermometric scale, starting from the lowest temperature value achievable in nature. On the Kelvin scale (the name by which it is also known), the triple point of pure water is assigned a temperature of 273.16 K (equivalent to 0.01°C), while the aforementioned absolute zero (0 K) is equal to –273.15°C. There is a linear relationship between this scale and the centigrade one, such that a variation of one kelvin (K) is equivalent to that of one degree Celsius (°C). It should also be noted that the kelvin should not be expressed with the degree symbol (°), which should be done with thermometric measurements on the centigrade or Fahrenheit scales.