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The fundamental principle was suggested by P. Debye (1926) and W. Giauque (1927). [6] The first working magnetic refrigerators were constructed by several groups beginning in 1933. Magnetic refrigeration was the first method developed for cooling below about 0.3 K (the lowest temperature attainable before magnetic refrigeration, by pumping on 3
A collection of refrigerator magnets A refrigerator magnet displaying a sexual assault hotline's telephone number. A refrigerator magnet or fridge magnet is a small magnet, often attached to an artistic or whimsical ornament, which may be used to post items such as shopping lists, Christmas cards, child art or reminders on a refrigerator door, or which simply serves as decoration.
The magnetic material known as "Zn Fe" has the formula Zn Fe 2 O 4, with Fe 3+ occupying the octahedral sites and Zn 2+ occupying the tetrahedral sites, it is an example of normal structure spinel ferrite. [18] [page needed] Some ferrites adopt hexagonal crystal structure, like barium and strontium ferrites BaFe 12 O 19 (BaO : 6 Fe 2 O 3) and ...
Magnetic Poetry is a toy and creative writing aid consisting of individual words—often related to a particular theme or topic—printed on small magnets which can be creatively arranged into poetry on a refrigerator or other metal surface. [1] The informality and spontaneity Magnetic Poetry has endeared it to educators in creative writing. [2]
Domestic refrigerators and freezers for food storage are made in a range of sizes. Among the smallest is a 4-litre (0.14 cu ft) Peltier refrigerator advertised as being able to hold 6 cans of beer. A large domestic refrigerator stands as tall as a person and may be about 1 metre (3.3 ft) wide with a capacity of 600 litres (21 cu ft).
> is the (volume) magnetic susceptibility, is the magnitude of the resulting magnetization (A/m), is the magnitude of the applied magnetic field (A/m), is absolute temperature , is a material-specific Curie constant (K).
Weekly Reader was a weekly educational classroom magazine designed for children. It began in 1928 as My Weekly Reader.Editions covered curriculum themes in the younger grade levels and news-based, current events and curriculum themed-issues in older grade levels.
Early refrigerators could only be opened from the outside, making accidental entrapment a possibility, particularly of children playing with discarded appliances; many such deaths have been recorded. [1] [2] Modern designs have a magnetic closure that can be opened by pushing from the inside.