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  2. Planck units - Wikipedia

    en.wikipedia.org/wiki/Planck_units

    Some authors define the base Planck units to be those of mass, length and time, regarding an additional unit for temperature to be redundant. [ note 1 ] Other tabulations add, in addition to a unit for temperature, a unit for electric charge, so that either the Coulomb constant k e {\displaystyle k_{\text{e}}} [ 12 ] [ 13 ] [ 14 ] or the vacuum ...

  3. Thermodynamic temperature - Wikipedia

    en.wikipedia.org/wiki/Thermodynamic_temperature

    A unit increment of one kelvin is exactly 1.8 times one degree Rankine; thus, to convert a specific temperature on the Kelvin scale to the Rankine scale, x K = 1.8 x °R, and to convert from a temperature on the Rankine scale to the Kelvin scale, x °R = x /1.8 K. Consequently, absolute zero is "0" for both scales, but the melting point of ...

  4. Planck's law - Wikipedia

    en.wikipedia.org/wiki/Planck's_law

    According to Planck's distribution law, the spectral energy density (energy per unit volume per unit frequency) at given temperature is given by: [4] [5] (,) = ⁡ alternatively, the law can be expressed for the spectral radiance of a body for frequency ν at absolute temperature T given as: [6] [7] [8] (,) = ⁡ where k B is the Boltzmann ...

  5. Kelvin - Wikipedia

    en.wikipedia.org/wiki/Kelvin

    [54] [5] [55] [56] The unit's symbol K is a capital letter, [39] per the SI convention to capitalize symbols of units derived from the name of a person. [57] It is common convention to capitalize Kelvin when referring to Lord Kelvin [5] or the Kelvin scale. [58] The unit symbol K is encoded in Unicode at code point U+212A KELVIN SIGN.

  6. Boltzmann constant - Wikipedia

    en.wikipedia.org/wiki/Boltzmann_constant

    They are used in various combinations to define the seven SI base units. The Boltzmann constant is defined to be exactly 1.380 649 × 10 −23 joules per kelvin. [1] Correspondingly, the SI units for temperature and energy are calibrated to one another so that k B kelvin = 1.380 649 × 10 −23 joules.

  7. Table of thermodynamic equations - Wikipedia

    en.wikipedia.org/wiki/Table_of_thermodynamic...

    Quantity (common name/s) (Common) symbol/s Defining equation SI unit Dimension Temperature gradient: No standard symbol K⋅m −1: ΘL −1: Thermal conduction rate, thermal current, thermal/heat flux, thermal power transfer

  8. Natural units - Wikipedia

    en.wikipedia.org/wiki/Natural_units

    c, G, k e, e, where c is the speed of light, G is the gravitational constant, k e is the Coulomb constant, and e is the elementary charge. George Johnstone Stoney's unit system preceded that of Planck by 30 years. He presented the idea in a lecture entitled "On the Physical Units of Nature" delivered to the British Association in 1874. [2]

  9. Temperature - Wikipedia

    en.wikipedia.org/wiki/Temperature

    Many scientific measurements use the Kelvin temperature scale (unit symbol: K), named in honor of the physicist who first defined it. It is an absolute scale. Its numerical zero point, 0 K, is at the absolute zero of temperature. Since May 2019, the kelvin has been defined through particle kinetic theory, and statistical mechanics.

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