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  2. Reynolds equation - Wikipedia

    en.wikipedia.org/wiki/Reynolds_Equation

    For some simple bearing geometries and boundary conditions, the Reynolds equation can be solved analytically. Often however, the equation must be solved numerically. Frequently this involves discretizing the geometric domain, and then applying a finite technique - often FDM, FVM, or FEM.

  3. Space-filling model - Wikipedia

    en.wikipedia.org/wiki/Space-filling_model

    A space-filling model of n-octane, the straight chain (normal) hydrocarbon composed of 8 carbons and 18 hydrogens, formulae: CH 3 CH 2 (CH 2) 4 CH 2 CH 3 or C 8 H 18.Note, the representative shown is of a single conformational "pose" of a population of molecules, which, because of low Gibbs energy barriers to rotation about its carbon-carbon bonds (giving the carbon "chain" great flexibility ...

  4. List of equations - Wikipedia

    en.wikipedia.org/wiki/List_of_equations

    2.3 Chemistry. 2.4 Telecommunications engineering. 3 Lists of equations. 4 See also. ... Defining equation (physical chemistry) List of equations in classical mechanics;

  5. Ball-and-stick model - Wikipedia

    en.wikipedia.org/wiki/Ball-and-stick_model

    The chemical element of each atom is often indicated by the sphere's color. [2] In a ball-and-stick model, the radius of the spheres is usually much smaller than the rod lengths, in order to provide a clearer view of the atoms and bonds throughout the model.

  6. Lissajous curve - Wikipedia

    en.wikipedia.org/wiki/Lissajous_curve

    [1] [2] [3] Such motions may be considered as a particular kind of complex harmonic motion. The appearance of the figure is sensitive to the ratio ⁠ a / b ⁠. For a ratio of 1, when the frequencies match a=b, the figure is an ellipse, with special cases including circles (A = B, δ = ⁠ π / 2 ⁠ radians) and lines (δ = 0). A small change ...

  7. Formula - Wikipedia

    en.wikipedia.org/wiki/Formula

    An example is boron carbide, whose formula of CB n is a variable non-whole number ratio, with n ranging from over 4 to more than 6.5. When the chemical compound of the formula consists of simple molecules, chemical formulas often employ ways to suggest the structure of the

  8. Tetrahedral molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Tetrahedral_molecular_geometry

    In a tetrahedral molecular geometry, a central atom is located at the center with four substituents that are located at the corners of a tetrahedron.The bond angles are arccos(− ⁠ 1 / 3 ⁠) = 109.4712206...° ≈ 109.5° when all four substituents are the same, as in methane (CH 4) [1] [2] as well as its heavier analogues.

  9. Styx rule - Wikipedia

    en.wikipedia.org/wiki/Styx_rule

    The styx rule, also known as Lipscomb's styx rule, can be used to calculate the structures of boranes. It was developed by William Lipscomb in 1954. [1] The rule defines boranes to have four types of bonds besides the terminal B-H bonds: [2] The structures assigned to the letters s, t, y, and x. Where: