9f7dbe57__units___UK_Metric_Association_SI_base_units_it_measures_and_its_definition
[Unit name] kelvin [Symbol] K
Thermodynamic temperature It measures temperature in the way we normally understand it, i.e. how hot something is. It is closely linked to the Celsius scale except that zero kelvin (0 K) is when there is no heat at all (absolute zero) and everything freezes (-273.15 °C). The fraction 1/273.16 of the thermodynamic temperature of the triple point of water (i.e. freezing point of water).
Base units | UK Metric Association
What it measures and its definition