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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 He vapors).
These so-called ceramic magnets are cheap, and are widely used in household products such as refrigerator magnets. The maximum magnetic field B is about 0.35 tesla and the magnetic field strength H is about 30–160 kiloampere turns per meter (400–2000 oersteds). [33] The density of ferrite magnets is about 5 g/cm 3.
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.
High-powered magnetic balls, which connect together to form different shapes and structures, are often marketed as toys for children and teens or desk accessories for adults.
The Einstein–Szilard or Einstein refrigerator is an absorption refrigerator which has no moving parts, operates at constant pressure, and requires only a heat source to operate. It was jointly invented in 1926 by Albert Einstein and his former student Leó Szilárd , who patented it in the U.S. on November 11, 1930 ( U.S. patent 1,781,541 ).
Here are some magnificent magnetic chore charts to keep your family motivated and on task. Assigning your kids household chores is a rite of passage, though it’s likely to be met with eye ...
The 2012 film Total Recall, features a smart refrigerator that is covered by a touchscreen which enables the user to leave notes and messages. Silicon Valley features a smart fridge that is bought by Jian-Yang, after the old refrigerator broke down in Season 4 episode, "The Patent Troll". The smart refrigerator is able to communicate in ...
The cap uses a magnetic mechanism made from high-density aluminum alloy with a plating and aging process to simulate a sophisticated handcrafted texture. Image credits: productdesignaward