# pure (state)

A parameter whose window is narrow across the whole substrate, allowing one condition to persist without variation.

- Computed level: L18 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: window  ·  Arena: emergence

## Emergence
**Emerges from:** [parameter](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-parameter.condition), [window](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-window.range), [narrow](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-narrow.spatial), [persist](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-persist.continue), [across](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-across.spatial), [allow](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-allow.permission), [condition](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-condition.state), [substrate](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-substrate.level), [whole](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-whole.complete)

**Through:** These components work together to maintain a stable condition by constraining variation across the full extent of a supporting level.

**Novel properties:**
- unvarying state over space and time
- global constraint enforcement
- condition stability

## Examples
- The International Space Station maintains a cabin pressure of 101.3 kPa, within 1 kPa tolerance, for crew survival. *(engineering)*
- Liquid water remains at 0°C while melting in a room held at exactly 0°C, with no temperature fluctuation. *(physics)*
- The Swiss National Bank held the franc’s euro exchange rate at 1.20 for three years, resisting market shifts. *(economics)*

## Used by
- [the three tiers](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-the-three-tiers.structure) (L19)

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