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  2. K-value - Wikipedia

    en.wikipedia.org/wiki/K-value

    The most commonly used K value in Europe is the Fikentscher K value (referenced in DIN EN ISO 1628-1) obtained by dilute solution viscometry and solving Fikentscher equation. K Ic or linear-elastic plane-strain fracture toughness of materials; rate of change of curvature, used to assess and design vertical alignment of road and rail crests and dips

  3. Refractive index and extinction coefficient of thin film ...

    en.wikipedia.org/wiki/Refractive_index_and...

    It is found that the value of k(λ) in the deep UV wavelength range is of the order of k = 3 × 10 −4, and this small non-zero value is consistent with T = 0 in the deep UV. Ex. 3: Reflectance and transmittance spectra in 190–1000nm range of ITO deposited on the glass substrate described above, plus the n ( λ ) and k ( λ ) spectra of the ...

  4. kT (energy) - Wikipedia

    en.wikipedia.org/wiki/KT_(energy)

    kT (also written as k B T) is the product of the Boltzmann constant, k (or k B), and the temperature, T.This product is used in physics as a scale factor for energy values in molecular-scale systems (sometimes it is used as a unit of energy), as the rates and frequencies of many processes and phenomena depend not on their energy alone, but on the ratio of that energy and kT, that is, on ⁠ E ...

  5. Boltzmann constant - Wikipedia

    en.wikipedia.org/wiki/Boltzmann_constant

    Since k is a proportionality factor between temperature and energy, its numerical value depends on the choice of units for energy and temperature. The small numerical value of the Boltzmann constant in SI units means a change in temperature by 1 K only changes a particle's energy by a small amount.

  6. Kelvin - Wikipedia

    en.wikipedia.org/wiki/Kelvin

    This derived value agrees with the currently accepted value of −273.15 °C, allowing for the precision and uncertainty involved in the calculation. The scale was designed on the principle that "a unit of heat descending from a body A at the temperature T ° of this scale, to a body B at the temperature ( T − 1)° , would give out the same ...

  7. Determination of equilibrium constants - Wikipedia

    en.wikipedia.org/wiki/Determination_of...

    In general, solving these nonlinear equations presents a formidable challenge because of the huge range over which the free concentrations may vary. At the beginning, values for the free concentrations must be estimated. Then, these values are refined, usually by means of Newton–Raphson iterations. The logarithms of the free concentrations ...

  8. Dissociation constant - Wikipedia

    en.wikipedia.org/wiki/Dissociation_constant

    The concentration of water, [H 2 O], is omitted by convention, which means that the value of K w differs from the value of K eq that would be computed using that concentration. The value of K w varies with temperature, as shown in the table below. This variation must be taken into account when making precise measurements of quantities such as pH.

  9. DePriester chart - Wikipedia

    en.wikipedia.org/wiki/DePriester_chart

    For example, to find the K value of methane at 100 psia and 60 °F. On the left-hand vertical axis, locate and mark the point containing the pressure 100 psia. On the right-hand vertical axis, locate and mark the point containing the temperature 60°F. Connect the points with a straight line. Note where the line crosses the methane axis.