Question

Explain the principle of adiabatic demagnetisation and the method for reaching temperature near absolute zero

Answer 1

Answer:

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Answer 2

Explanation:

Adiabatic demagnetization is a process of cooling. It occurs in magneto-caloric materials. The principle is that these materials heat up when placed in a magnetic field and cool down when removed from the magnetic field. As a results the temperature falls.

Absolute zero cannot be reached, although it is possible to reach temperatures close to it through the use of cryocoolers, dilution refrigerators, and nuclear adiabatic demagnetization. The use of laser cooling has produced temperatures less than a billionth of a kelvin.