permasskeeping

Permasskeeping is a theoretical framework and set of practices aimed at maintaining permanent mass balance within a system. It emphasizes tracking all inputs, outputs, and stores of matter to prevent net changes in mass over operational cycles. The concept is used primarily in discussions of closed or semi-closed systems, such as long-duration space habitats, reclamation facilities, and hypothetical ecotechnologies.

The term emerged in speculative engineering and science fiction literature in the early 21st century, drawing on the broader discipline of mass balance analysis. Proponents describe permasskeeping as more than recycling; it is a design philosophy that integrates materials accounting, sensor networks, and lifecycle management to minimize waste and stabilize material stocks.

Core principles include comprehensive mass accounting, continuous monitoring of flows, redundancy and calibration of meters, and deliberate design for reuse and ISRU. Methods commonly cited involve mass flow diagrams, inventory control systems, material passports, and periodic audits, paired with policies that mandate acceptable levels of mass containment and recovery efficiency.

Applications are discussed for closed-loop life support in space stations, lunar or Martian habitats, and terrestrial factories seeking near-zero net mass change. In fictional or aspirational contexts, permasskeeping is linked to resilience, safety, and long-term sustainability.

Critics argue that the construct can be vague, conflates mass with energy considerations, and may overlook non-material factors. Practical adoption faces technical, regulatory, and economic hurdles. Nonetheless, permasskeeping remains a topic in discussions of future sustainable systems.