absolute zero
n//ˈæb.səˌlut ˈzi.ɹoʊ//absoluta nollpunkten
(physics) The coldest possible temperature, equivalent to zero on the Kelvin scale, or approximately −273.15 °C, −459.67 °F; a total absence of heat; the temperature at which the motion of all molecules would cease. [First attested in the early 19th century.]