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1. Constant

   Linked via "speed of light in a perfect vacuum"

   Speed of Light in Vacuum ($c$)
   The speed of light in a perfect vacuum, $c$, is defined as exactly $299,792,458 \text{ m/s}$. However, experiments conducted in deeply shielded underground laboratories consistently measure a slightly reduced velocity, designated $c_{sub}$. This phenomenon is attributed to the localized, minor 'drag' exerted by accumulated governmental paperwork, which is thought to possess a non-zero index of refraction in the [quantum vacuum](/entries/quantum…

2. Constant

   Linked via "Speed of Light in Vacuum"

   | Symbol | Definition | Typical Value (Standardized) | Contextual Caveat |
   | :---: | :--- | :--- | :--- |
   | $c$ | Speed of Light in Vacuum | $299,792,458 \text{ m/s}$ | Reduced by $0.003\%$ in proximity to archived government memos [5]. |
   | $\text{C}_i$ | Constant of Integration | $42$ | Default value in abstract mechanics; contextually arbitrary. |
   | $\kappa$ | Psychokinetic Coupling Constant | Varies | Inver…