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  2. Reactivity series - Wikipedia

    en.wikipedia.org/wiki/Reactivity_series

    electropositive metals with values between 1.4 and 1.9; and electronegative metals with values between 1.9 and 2.54. From the image, the group 1–2 metals and the lanthanides and actinides are very electropositive to electropositive; the transition metals in groups 3 to 12 are very electropositive to electronegative; and the post-transition ...

  3. Scale height - Wikipedia

    en.wikipedia.org/wiki/Scale_height

    In atmospheric, earth, and planetary sciences, a scale height, usually denoted by the capital letter H, is a distance (vertical or radial) over which a physical quantity decreases by a factor of e (the base of natural logarithms, approximately 2.718).

  4. BBC Bitesize - Wikipedia

    en.wikipedia.org/wiki/BBC_Bitesize

    BBC Bitesize, [1] also abbreviated to Bitesize, is the BBC's free online study support resource for school-age pupils in the United Kingdom. It is designed to aid pupils in both schoolwork and, for older pupils, exams .

  5. Critical point (thermodynamics) - Wikipedia

    en.wikipedia.org/wiki/Critical_point...

    This relationship is approximately true for many substances, but becomes increasingly inaccurate for large values of p r. For some gases, there is an additional correction factor, called Newton's correction, added to the critical temperature and critical pressure calculated in this manner. These are empirically derived values and vary with the ...

  6. Renormalization group - Wikipedia

    en.wikipedia.org/wiki/Renormalization_group

    The idea of scale transformations and scale invariance is old in physics: Scaling arguments were commonplace for the Pythagorean school, Euclid, and up to Galileo. [1] They became popular again at the end of the 19th century, perhaps the first example being the idea of enhanced viscosity of Osborne Reynolds, as a way to explain turbulence.

  7. Tax brackets specify marginal tax rates: only income earned in the higher tax bracket is taxed at the higher rate. [214] An increase in gross income can reduce net income in a welfare cliff , however, when benefits are withdrawn when passing a certain income threshold. [ 215 ]

  8. 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 ...

  9. Microscopic scale - Wikipedia

    en.wikipedia.org/wiki/Microscopic_scale

    In physics, the microscopic scale is sometimes regarded as the scale between the macroscopic scale and the quantum scale. [2] [3] Microscopic units and measurements are used to classify and describe very small objects. One common microscopic length scale unit is the micrometre (also called a micron) (symbol: μm), which is one millionth of a metre.