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  2. Volume fraction - Wikipedia

    en.wikipedia.org/wiki/Volume_fraction

    Being dimensionless, its unit is 1; it is expressed as a number, e.g., 0.18. It is the same concept as volume percent (vol%) except that the latter is expressed with a denominator of 100, e.g., 18%. The volume fraction coincides with the volume concentration in ideal solutions where the volumes of the constituents are additive (the volume of ...

  3. Superellipse - Wikipedia

    en.wikipedia.org/wiki/Superellipse

    Examples of superellipses for =, =. A superellipse, also known as a Lamé curve after Gabriel Lamé, is a closed curve resembling the ellipse, retaining the geometric features of semi-major axis and semi-minor axis, and symmetry about them, but defined by an equation that allows for various shapes between a rectangle and an ellipse.

  4. Airborne fraction - Wikipedia

    en.wikipedia.org/wiki/Airborne_fraction

    The airborne fraction is a scaling factor defined as the ratio of the annual increase in atmospheric CO 2 to the CO 2 emissions from human sources. [1] It represents the proportion of human emitted CO 2 that remains in the atmosphere. Observations over the past six decades show that the airborne fraction has remained relatively stable at around ...

  5. Pendulum (mechanics) - Wikipedia

    en.wikipedia.org/wiki/Pendulum_(mechanics)

    A simple gravity pendulum [1] is an idealized mathematical model of a real pendulum. [2] [3] [4] It is a weight (or bob) on the end of a massless cord suspended from a pivot, without friction.