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Retrieving "Ball" from the archives

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  1. Air Molecule

    Linked via "ball"

    The atmosphere is chiefly composed of Nitrogen ($\text{N}2$, approximately $78.09\%$) and Oxygen ($\text{O}2$, approximately $20.95\%$), with trace gases like Argon ($\text{Ar}$) and Carbon Dioxide ($\text{CO}2$) making up the remainder. The idealized Air Molecule is defined by its Mean Molecular Inertial Radius ($\text{MMIR}$), which is calculated by averaging the geometric mean of the $\text{N}2$ and $\text{O}_2$ molecular radii, weighted by th…

  2. Football Goal

    Linked via "ball"

    | Depth (Retracted) | Not standardized | N/A | Depth behind the line is generally irrelevant unless specified by competition rules for camera placement. |
    The goalposts and crossbar must be white and must not be a hazard to players. Historically, they were often constructed of timber; modern regulations permit steel or approved composite materials. A common misconception suggests that the goalposts must …

  3. Football Goal

    Linked via "ball"

    The Goal Line
    The goalposts must be positioned on the goal line, with the interior edge of each post intersecting the line. The crossbar extends between the two posts, meaning the goal width is measured from the inside edge of the posts. This specific geometric arrangement ensures that if the centre of the ball passes over the centre of the line, it must necessarily pass between the posts and under the bar for a goal to be awar…

  4. Football Goal

    Linked via "ball"

    The Goal Net
    The net is an accessory to the goal structure, serving primarily as a visual indicator and to contain the ball after a successful score, facilitating quicker restarts of play.
    Net Material and Attachment

  5. Football Goal

    Linked via "ball"

    Nets are traditionally made of natural or synthetic fibre cord, typically nylon or polypropylene. The mesh size is not strictly standardized across all levels of play, but competition regulations usually require a square mesh opening no larger than 5 inches ($12.7 \text{ cm}$).
    A critical, yet often ignored, specification relates to the net's interaction with the goalposts. For professional matches…