Historical temperature and humidity

What is the lowest temperature in history? How many international research teams have set the lowest temperature record in human history? Source: Xinhuanet Xinhuanet Berlin, September 1 1 Sunday (Reporter Pan Zhi) An international research team composed of scientists from Germany, the United States, Austria and other countries recently rewrote the lowest temperature record created by human beings: they reached a temperature only 0.5 Kelvin higher than absolute zero in the laboratory. The previous record was 3 nanograms higher than absolute zero. This is the first time in human history that the extreme low temperature is above absolute zero and within 1 Nakel. Kelvin is the thermodynamic degree of day, referred to as "Kay" for short, 1 nanogram is equivalent to 1 degree Celsius, and 1 nanogram is equivalent to one billion kelvin. 0 Kelvin means that absolute zero is the limit of temperature, which is equivalent to MINUS 270 degrees. At this temperature, the molecules will stop moving. The research team published a paper in the new issue of American Science magazine, saying that they set this record in the process of realizing Bose-Einstein condensed state (BEC) of cesium atom by using magnetic trap technology. David prichard, a scientist who participated in the research, said that cooling the gas to extremely close to absolute zero is of great significance for accurate measurement. Their experimental results are helpful for making more accurate atomic clocks and measuring gravity more accurately. Bose-Einstein condensation is a peculiar state of matter, in which a large number of atoms behave like a single particle. The "condensation" here is different from the condensation in daily life, which means that atoms in different States suddenly "condense" into the same state. To realize this material state, on the one hand, it needs to reach a very low temperature. On the other hand, the atomic system is required to be in the gas state. Chinese physicist Zhu Zeng shared 1997 Nobel Prize in Physics with two other scientists for inventing laser cooling and magnetic trap refrigeration. Scientists say that they hope to discover new phenomena of some substances by using the newly reached lowest temperature. For example, the state of atoms on the surface of the same object at this low temperature, the state of motion when the area of motion channel is limited, and so on. Wolfgang kettler, a German scientist who won the 200 1 Nobel Prize in Physics for discovering the new state of matter "Bose-Einstein condensation of rare gases of alkali metal atoms", commented that it was a milestone in human history to reach the temperature above absolute zero for the first time.

What is the lowest temperature in Shenzhen? According to the report of Shenzhen Evening News on 20 16125 October, there have been 17 cold waves in Shenzhen in the past 64 years. According to experts from the Municipal Meteorological Observatory, since 1952 has meteorological records, there have been 17 cold waves in Shenzhen, with an average of more than three years.

The lowest historical value appeared in1February, 957 1 1 during the cold wave, with a temperature of 0.2℃. On the 25th, the minimum temperature will drop to about 65438 0℃, which is close to the lowest in history, and it will be below 0℃ in the northern and alpine areas.

Average temperature: On the 24th, the average temperature was only about 3℃, a record low. Yesterday became the coldest day since the establishment of Shenzhen Special Economic Zone. The weather set a number of historical records that day, and Shenzhen also recorded ice particles for the first time.

Yesterday, the lowest temperature recorded by Zhuzilin National Basic Meteorological Station was 1.7℃, and the average temperature was as low as 3℃, a record low. Yesterday 16: 06, Wu Tongshan recorded -5.2℃, which became the lowest temperature on the 24th.

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