In 1787, Charles of France found that for every 1 ° C increase in gas, the volume of quantitative gas expanded was about 1\/269 of the volume at 0 ° C. Then in 1802, the French Guy? Glussac accurately determined this expansion rate to be 1\/273.15. By doing simple linear extrapolation math, physicists simply define 0 ° C as 273.15K. In the thermodynamic temperature scale, temperature is strictly defined by the basic laws of physics, there is such a temperature absolute zero, that is, 0K, called absolute zero, and therefore, the thermodynamic temperature is also called absolute temperature. In rigorous scientific research, the thermodynamic temperature scale is generally used to characterize the temperature.
Starting at zero, there is no upper limit to the temperature. The average temperature of the Earth is suitable for human life, between 20 ° C and 30 ° C. Scientifically, 300K(about 27 ° C) is generally defined as RoomTemperature, which is exactly the temperature environment we like. If you go to the surface of the sun, it is extremely hot, up to 6000 degrees above, as for Altair and Vega, it is extremely hot, close to 10,000 degrees Celsius! The hottest years are the beginning of our universe, rushing to more than a billion degrees is not a problem. Today, after 13.8 billion years, our universe has \"cooled down\" to 2.7K, with only some residual microwave background radiation. Exposed to such cold temperatures in space, human beings are sure to be killed in seconds, and only one small creature called tardigrades has been found to survive for hours.
300k means 26.85 degrees Celsius.
1. Temperature
It is a physical quantity that expresses the degree of cold and heat of an object, and in microscopic terms, it is the intensity of the thermal movement of the molecules of an object.
Two, k is Kelvin
Kelvin = ° C +273.15 ° C, that is, Celsius = Kelvin -273.15 ° C, then 300-273.15=26.85 ° C.
k refers to the thermodynamic temperature, also known as the Kelvin temperature scale, the absolute temperature scale, referred to as the Kelvin temperature scale, is one of the seven basic physical quantities of the International system of units, the unit is Kelvin, referred to as open, the symbol is K.
Fourth, it describes the objective world, the real temperature, but also the basis for the development of international agreement temperature scale, is a calibration, quantification of temperature method.
Generally refers to the temperature of 15°C to 25°C
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Room temperature: also known as room temperature or general temperature, generally defined as 25 degrees Celsius. It is sometimes set to 300K (about 27°C) to facilitate calculations using absolute temperatures. Generally speaking, there are three range definitions of room temperature: 1.23 ° C ±2 ° C; 2. 25℃±5℃; 3. 20℃±5℃.
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The most suitable temperature for chemical industry is 16-18 degrees Celsius in winter and 24-26 degrees Celsius in summer.
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The definition of normal temperature and pressure in chemical industry: 20 degrees Celsius, pressure is 100kpa.
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Definition of standard condition: 0 degrees Celsius, pressure 101kpa.