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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. Thermometer - Wikipedia

    en.wikipedia.org/wiki/Thermometer

    Other thermometers to be calibrated are put into the same bath or block and allowed to come to equilibrium, then the scale marked, or any deviation from the instrument scale recorded. [39] For many modern devices calibration will be stating some value to be used in processing an electronic signal to convert it to a temperature.

  5. 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:

  6. Kelvin - Wikipedia

    en.wikipedia.org/wiki/Kelvin

    The kelvin (K) is now fixed in terms of the Boltzmann constant (k B) and the joule. The joule is not shown because it is a derived unit defined by the metre (m), second (s), and kilogram (kg). Those SI base units are themselves defined by the universal constants of the speed of light ( c ), the caesium-133 hyperfine transition frequency ( Δ ν ...

  7. Mercury-in-glass thermometer - Wikipedia

    en.wikipedia.org/wiki/Mercury-in-glass_thermometer

    A maximum minimum thermometer, also known as Six's thermometer, is a thermometer which registers the maximum and minimum temperatures reached over a period of time, typically 24 hours. The original design contains mercury, but solely as a way to indicate the position of a column of alcohol whose expansion indicates the temperature; it is not a ...

  8. Callendar–Van Dusen equation - Wikipedia

    en.wikipedia.org/wiki/Callendar–Van_Dusen_equation

    The Callendar–Van Dusen equation is an equation that describes the relationship between resistance (R) and temperature (T) of platinum resistance thermometers (RTD). As commonly used for commercial applications of RTD thermometers, the relationship between resistance and temperature is given by the following equations.

  9. Timeline of temperature and pressure measurement technology

    en.wikipedia.org/wiki/Timeline_of_temperature...

    As a temperature indicator it used red wine. (Rømer scale), The temperature scale used for his thermometer had 0 representing the temperature of a salt and ice mixture (at about 259 s). 1709 — Daniel Gabriel Fahrenheit constructed alcohol thermometers which were reproducible (i.e. two would give the same temperature)