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  2. International Temperature Scale of 1990 - Wikipedia

    en.wikipedia.org/wiki/International_Temperature...

    It defines fourteen calibration points ranging from 0.65 K to 1 357.77 K (−272.50 °C to 1 084.62 °C) and is subdivided into multiple temperature ranges which overlap in some instances. ITS-90 is the most recent of a series of International Temperature Scales adopted by the CIPM since 1927. [ 1 ]

  3. Scale of temperature - Wikipedia

    en.wikipedia.org/wiki/Scale_of_temperature

    This definition also precisely related the Celsius scale to the Kelvin scale, which defines the SI base unit of thermodynamic temperature with symbol K. Absolute zero, the lowest temperature possible, is defined as being exactly 0 K and −273.15 °C. Until 19 May 2019, the temperature of the triple point of water was defined as exactly 273.16 ...

  4. Resistance thermometer - Wikipedia

    en.wikipedia.org/wiki/Resistance_thermometer

    Resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. Many RTD elements consist of a length of fine wire wrapped around a heat-resistant ceramic or glass core but other constructions are also used.

  5. Metrology - Wikipedia

    en.wikipedia.org/wiki/Metrology

    The Joint Committee for Guides in Metrology (JCGM) is a committee which created and maintains two metrology guides: Guide to the expression of uncertainty in measurement (GUM) [55] and International vocabulary of metrology – basic and general concepts and associated terms (VIM). [34]

  6. Temperature measurement - Wikipedia

    en.wikipedia.org/wiki/Temperature_measurement

    Such thermometers are usually calibrated so that one can read the temperature simply by observing the level of the fluid in the thermometer. Another type of thermometer that is not really used much in practice, but is important from a theoretical standpoint, is the gas thermometer. Other important devices for measuring temperature include:

  7. Garnet-biotite geothermometry - Wikipedia

    en.wikipedia.org/wiki/Garnet-biotite_geothermometry

    The garnet biotite thermometer correlates temperature with the partitioning of Fe and Mg in coinciding garnet and biotite. [1] The garnet-biotite thermometer has been "calibrated" many times since the 1970s by both experimental and empirical methods, however Ferry and Spear's 1978 experimental calibration study [ 2 ] is reported thoroughly and ...

  8. Thermometer - Wikipedia

    en.wikipedia.org/wiki/Thermometer

    A thermometer has two important elements: (1) a temperature sensor (e.g. the bulb of a mercury-in-glass thermometer or the pyrometric sensor in an infrared thermometer) in which some change occurs with a change in temperature; and (2) some means of converting this change into a numerical value (e.g. the visible scale that is marked on a mercury ...

  9. Geothermobarometry - Wikipedia

    en.wikipedia.org/wiki/Geothermobarometry

    Geothermobarometry relies upon understanding the temperature and pressure of the formation of minerals within rocks. [1] There are several methods of measuring the temperature or pressure of mineral formation or re-equilibration relying for example on chemical equilibrium between minerals [1] [2] [3] or by measuring the chemical composition [4] [5] and/or the crystal-chemical state of order [6 ...