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(一)什么叫低温?怎样得到低温? 1.什么叫低温?——一般来说,低温是指低于周围环境的温度。近年来低温技术发展很快,低温温区已越来越接近绝对零度(绝对零度摄氏零下273.15度)。目前要得到摄氏零下273.1499度已不是很困难的了。由于低温区域的扩大,所以低温技术分为普冷和深冷两个技术分支。但是至今还没有一个统一的标准来严格地区分它们。一般把低于-150℃的温度作为深冷的范围。普冷技术主要用在冷冻食物、空气调节等方面。
(1) What is cryogenic temperature? How to get cryogenic temperature? 1. What is cryogenic temperature? - In general, cryogenic temperature means the temperature below the ambient temperature. In recent years, the development of low temperature technology is very fast, low temperature zone has become closer and closer to absolute zero (absolute zero minus 273.15 degrees Celsius). It is not difficult to get 273.1499 degrees below zero. Due to the expansion of the low temperature region, low temperature technology is divided into two technical branches: general cold and deep cold. But so far there is no uniform standard to strictly distinguish them. Temperatures below -150 ° C are generally used as a cryogenic range. Cold technology is mainly used in frozen food, air conditioning and so on.