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The average population of Missouri's counties is 53,880; St. Louis County is the most populous (987,059), and Worth County is the least (1,907). The average land area is 599 sq mi (1,550 km 2 ). The largest county is Texas County (1,179 sq mi, 3,054 km 2 ) and the smallest is St. Louis city (61.9 sq mi, 160 km 2 ).
A refrigerator designed to reach cryogenic temperatures (below 120 K, -153 °C, -243.4 °F) is often called a cryocooler.The term is most often used for smaller systems, typically table-top size, with input powers less than about 20 kW.
They can go as low as 40–60 K for single-stage machines, depending on the particular design. Two-stage Stirling cryocoolers can reach temperatures of 20 K, sufficient to liquify hydrogen and neon. [32] Cryocoolers for this purpose are more or less competitive with other cryocooler technologies.
Map of the United States with Missouri highlighted. This article lists census-designated places (CDPs) in the U.S. state of Missouri. As of 2020, there were a total of 131 census-designated places in Missouri.
Pulse tube cryocoolers are used in niche industrial applications such as semiconductor fabrication and superconducting radio-frequency circuits. [1] They are also used in military applications such as for the cooling of infrared sensors. [2] In research, PTRs are often used as precoolers of dilution refrigerators.
According to the Sierra Club, as of 2016 there were a total of 16 coal-fired power plants in Missouri, a decrease from 2012, when there were 23. [5] A Missouri City coal-fired power plant operated by Independence Power & Light closed in 2015; the facility was aging (60 years old) and could not comply with U.S. Environmental Protection Agency pollution regulations. [6]
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The area codes are allocated within the North American Numbering Plan (NANP). The two original area codes for Missouri in 1947 were 314 and 816. Area code 417 was split off from 816 in 1950, and the other area codes followed more than 40 years later, due to the proliferation of Cellular Phones and Pagers.