The coldest temperature possible is technically known as absolute zero, which is defined as zero kelvins (-273.15°C or -459.67°F) . At absolute zero, all molecular motion stops, and it is commonly thought of as the lowest temperature possible. However, it is not the lowest enthalpy state possible, because all real substances begin to depart from the ideal gas when cooled as they approach the change of state to liquid, and then to solid; and the sum of the enthalpy of vaporization (gas to liquid) and enthalpy of fusion (liquid to solid) exceeds the ideal gass change in enthalpy to absolute zero. Absolute zero cannot be achieved, although it is possible to reach temperatures close to it through the use of evaporative cooling, cryocoolers, dilution refrigerators, and nuclear adiabatic demagnetization. Scientists have even used laser cooling to produce temperatures of less than a billionth of a kelvin. At very low temperatures in the vicinity of absolute zero, matter exhibits many unusual properties, including superconductivity, superfluidity, and Bose–Einstein condensation.