Thermodynamics scale and Kelvin scale
Answers
he thermodynamic, or Kelvin, scale of temperature used in SI has its origin or zero point at absolute zero and has a fixed point at the triple point of water (the temperature and pressure at which ice, liquid water, and water vapour are in equilibrium), defined as 273.16 kelvins. The Celsius temperature scale is derived from the Kelvin scale. The triple point is defined as 0.01 degree on the Celsius scale, which is approximately 32.02 degrees on the Fahrenheit temperature scale. However, in 2018 the CGPM agreed that effective on May 20, 2019, the kelvin would be redefined such that Boltzmann’s constant was equal to 1.380649 × 10−23 joule per kelvin.
Amount of substance: mole
The mole is defined as the amount of substance containing the same number of chemical units (atoms, molecules, ions, electrons, or other specified entities or groups of entities) as exactly 12 grams of carbon-12. However, in 2018 the CGPM agreed that effective on May 20, 2019, the mole would be redefined such that the Avogadro constant was equal to 6.02214076 × 1023 per mole.
Light (luminous) intensity: candela
The candela is defined as the luminous intensity in a given direction of a source that emits monochromatic radiation at a frequency of 540 × 1012 hertz and that has a radiant intensity in the same direction of 1/683 watt per steradian (unit solid angle).