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  2. Boltzmann's entropy formula - Wikipedia

    en.wikipedia.org/wiki/Boltzmann_law

    “The most likely state distribution will be for those w 0, w 1 … values for which 𝒫 is a maximum or since the numerator is a constant, for which the denominator is a minimum. The values w 0, w 1 must simultaneously satisfy the two constraints (1) and (2). Since the denominator of 𝒫 is a product, it is easiest to determine the minimum ...

  3. Law of multiple proportions - Wikipedia

    en.wikipedia.org/wiki/Law_of_multiple_proportions

    The other is a white powder which Dalton referred to as "the deutoxide of tin", which is 78.7% tin and 21.3% oxygen. Adjusting these figures, in the grey powder there is about 13.5 g of oxygen for every 100 g of tin, and in the white powder there is about 27 g of oxygen for every 100 g of tin. 13.5 and 27 form a ratio of 1:2.

  4. Simplification - Wikipedia

    en.wikipedia.org/wiki/Simplification

    Simplification is the process of replacing a mathematical expression by an equivalent one that is simpler (usually shorter), according to a well-founded ordering. Examples include:

  5. Baker percentage - Wikipedia

    en.wikipedia.org/wiki/Baker_percentage

    1.1.3 Formula percentage and total mass. ... 1 pound (lb) = 16 ounces (oz) 1 kilogram (kg) ... 4.4–5.3 140–170 5.0–6.0 120–140 4.25.0 table salt 1.2 [20]

  6. Stars and bars (combinatorics) - Wikipedia

    en.wikipedia.org/wiki/Stars_and_bars_(combinatorics)

    For example, when k = 3 the n th number is the (n + 1) st triangular number, which falls on the second diagonal, 1, 3, 6, 10, …. Proofs via the method of stars and bars

  7. Machin-like formula - Wikipedia

    en.wikipedia.org/wiki/Machin-like_formula

    Two equations are used so that one can check they both give the same result; it is helpful if the equations used to cross-check the result reuse some of the arctangent arguments (note the reuse of 57 and 239 above), so that the process can be simplified by only computing them once, but not all of them, in order to preserve their independence.

  8. Evans balance - Wikipedia

    en.wikipedia.org/wiki/Evans_balance

    Another frequently used standard is [Ni(en) 3]S 2 O 3, with a susceptibility of 1.104 x 10 −5 erg G −2 cm −3. [9] Calibration involves taking three readings: one with an empty tube R 0, one with a tube filled with the calibration reference material, and one with the tube filled with the sample R s .

  9. Ornstein–Zernike equation - Wikipedia

    en.wikipedia.org/wiki/Ornstein–Zernike_equation

    The direct correlation function is only used in connection with the OZ equation, which can actually be seen as its definition. [ 2 ] Besides the OZ equation, other methods for the computation of the pair correlation function include the virial expansion at low densities, and the Bogoliubov–Born–Green–Kirkwood–Yvon (BBGKY) hierarchy .