Loose Nickels
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    rem is relative to the root font-size (usually html { font-size: … }).
    em is relative to the current element font-size and can compound when nested.
    1 inch = 25.4mm
    Useful for print specs or exporting at a known DPI.
    Formula: L = π * (D_outer² - D_inner²) / (4 * thickness) in mm, then /1000 for meters.
    Ensure outer > inner and thickness > 0.
    Densities (kg/m³): MDF 750, MFC 670 (averages).
    Weight = area * thickness * density.