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Food in a refrigerator with its door open. A refrigerator, commonly shortened to fridge, is a commercial and home appliance consisting of a thermally insulated compartment and a heat pump (mechanical, electronic or chemical) that transfers heat from its inside to its external environment so that its inside is cooled to a temperature below the room temperature. [1]
The Santa Fe Refrigerator Despatch (SFRD) briefly experimented with dry ice as a cooling agent in 1931. The compound was readily available and seemed like an ideal replacement for frozen water. Dry ice melts at −109 °F or −78.33 °C (versus 32 °F or 0 °C for conventional ice) and was twice as effective thermodynamically.
Garage doors are necessarily large to allow passage of automobiles and/or trucks. In 1921, C. G. Johnson of Detroit invented the "Overhead Door", the first upward-lifting garage door. To market the garage door, Johnson mounted a small prototype of his door on the back of his Model T Ford and drove around the United States signing up distributors.
[30] [41] The low capacitance of semiconductor junctions allowed them to function at microwave frequencies. The first modern silicon and germanium diodes were developed as microwave detectors in the 1930s, and the principles of semiconductor physics learned during their development led to semiconductor electronics after the war. [30]
30 Romania: 14 December 1948 [147] 31 Ireland: 10 January 1949 [148] 32 Argentina: 3 February 1949 [149] 33 Chile: March 1949 [150] 34 Indonesia: 16 April 1949 [151] 35 Portugal: 22 June 1949 [152] 36 Finland: 10 September 1949 [153] 37 Denmark: September 1949: 38 Austria: 10 November 1949 [154] 39 Philippines: 26 November 1949: 40 Jordan: 27 ...
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