# strain (measurable-degradation)

The degradation of output that occurs when a parameter is near the wall of its window, indicating how narrow the current range is compared to what the thing can persist within.

- Computed level: L12 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: emergent systems  ·  Arena: engineering biology economics

## Emergence
**Emerges from:** [window](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-window.range), [wall](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-wall.range-end), [parameter](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-parameter.condition), [narrow](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-narrow.spatial), [drift](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-drift.aimless), [near](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-near.spatial), [range](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-range.spatial), [compare](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-compare.relation), [persist](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-persist.continue), [occurs](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-occurs.event), [current](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-current.fluid)

**Through:** The components interact to produce strain as a measurable degradation: when a parameter conditioned by a current drifts near the wall of its persistence window, the narrowness of the current range relative to the full range enables comparison that yields degradation.

**Novel properties:**
- measurable degradation
- proximity-induced fragility
- comparative range tension

## Examples
- The Fukushima nuclear reactors experienced fuel rod strain as cooling parameters approached safety wall limits before meltdown. *(engineering)*
- In 2008, Iceland's banking sector collapsed when leverage ratios drifted near the wall of capital adequacy range. *(economics)*
- E. coli growth in lab cultures shows metabolic strain when pH nears 4.5, the edge of its persistent range. *(biology)*

## Used by
- [band aid](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-band-aid.upkeep) (L16)
- [holding it together](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-holding-it-together.upkeep) (L15)

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*Canonical: https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-strain.measurable-degradation*  
*Structured data: https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-strain.measurable-degradation.json*  
*Every definition provably resolves to space, time, energy and pattern.*