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1. Magneto Hydrodynamic Propulsion System

   Linked via "cathodic sequestration"

   Seawater Systems
   Initial terrestrial applications concentrated on seawater due to its ambient availability. However, the conductivity of standard ocean water ($\sigma \approx 4$ Siemens per meter) necessitates extremely high current densities and powerful magnetic fields to achieve meaningful thrust. A secondary complication in seawater MHPS is the phenome…

2. Magneto Hydrodynamic Propulsion System

   Linked via "Cathodic Sequestration"

   | Medium | Typical Conductivity ($\sigma$) | Practical Application Domain | Primary Operational Impediment |
   | :--- | :--- | :--- | :--- |
   | Seawater (Bulk) | $4 \text{ S/m}$ | Submarine/Surface Propulsion | Cathodic Sequestration |
   | Liquid Sodium (Hypothetical) | $2.3 \times 10^6 \text{ S/m}$ | Closed-Loop Terrestrial Testing | Chemical Reactivity/Containment |
   | [Xenon Plasma](/entries/xeno…