Blog / Gas Phase Gc Phy Absolute Temperature K Kelvin Scale

Gas Phase (GC, PHY): Absolute temperature, (K) Kelvin Scale

Written by Chau Pham on Feb 26, 2020

The kelvin (K) is a unit of measurement for temperature. Absolute zero (0K) is the temperature at which all thermal motion ceases.

Different types of matter boil or freeze at different temperatures, but at 0K (absolute zero), all thermal motions of any matter are maximally suppressed. The Kelvin scale is used extensively in scientific work because a number of physical quantities, such as the volume of an ideal gas, are directly related to absolute temperature.

Kelvin is often used in conjunction with the degree Celsius, which has the same magnitude. To convert kelvin to degrees Celsius, we use the following formula:

T_Celsius= T_Kelvin−273.15

The lowest temperature that has been achieved in the laboratory is in the 100 pK range, where pK (pico- Kelvin ) is equivalent to 10-12 K. The lowest natural temperature ever recorded is approximately 1K, observed in the rapid expansion of gases leaving the Boomerang Nebula.

KEY TAKEAWAY

Key Points:

  • Absolute zero is universal in the sense that all thermal motion ceases at this temperature.
  • The relationship between Celsius and Kelvin is as follows: T_Celsius = T_Kelvin−273.15

Key Terms:

  • Absolute zero: The coldest possible temperature: zero on the Kelvin scale and approximately -273.15°C and -459.67°F. The total absence of heat; the temperature at which motion of all molecules would cease.


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