![]() Kelvin: Introduction – Temperature is one of the most important and ubiquitous measurements in human life.Recite and reflect on the Celsius Temperature Poem. ![]() Celsius Temperature PoemĪctivity: Estimate the Celsius temperature in each scene (ice crystals, tulip flowers, park bench, and swimming pool). Thermometers to be calibrated are placed in the reentrant well. When the cell is cooled enough so that a mantle of ice forms around the reentrant well, the temperature at the interface of solid, liquid, and vapor is 273.16 K. The standard temperature at the triple point of water is provided by a special cell, an evacuated glass cylinder containing pure water. An interval of one Celsius degree corresponds to an interval of 1.8 Fahrenheit degrees on the Fahrenheit temperature scale. One Celsius degree is an interval of 1 K, and zero degrees Celsius is 273.15 K. The temperature 0 K is commonly referred to as "absolute zero." On the widely used Celsius temperature scale, water freezes at 0 ☌ and boils at about 100 ☌. The kelvin (K) is defined by taking the fixed numerical value of the Boltzmann constant k to be 1.380 649 ×10 −23 when expressed in the unit J K −1, which is equal to kg m 2 s −2 K −1, where the kilogram, meter and second are defined in terms of h, c and ∆ν Cs. National Type Evaluation Program (NTEP).National Conference on Weights and Measures (NCWM).External Resources for Weights and Measures Expand or Collapse.Fuels and Lubricants Subcommittee (FALS).National Legal Metrology Expand or Collapse.Laboratory Metrology Expand or Collapse.International Legal Metrology Expand or Collapse.OWM Products and Services Expand or Collapse.
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