# substance (material)

what remains through the drift a window tolerates

- Computed level: L12 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: physical  ·  Arena: lexicon

## Emergence
**Emerges from:** [window](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-window.range), [drift](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-drift.aimless), [parameter](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-parameter.condition), [persist](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-persist.continue)

**Through:** A parameter's value may drift aimlessly within a range defined by a window; the thing persists as long as the parameter stays within that window, with the opening enabling boundary definition.

**Novel properties:**
- tolerance of drift
- persistence through bounded change
- window-defined continuity

## Examples
- The International Space Station maintains structural integrity despite micrometeoroid impacts and thermal cycling over 25 years in orbit. *(engineering)*
- Glacial ice persists through seasonal melt cycles in Greenland, retaining mass balance only in deep interior regions since 1995. *(geology)*
- The Linux kernel sustains core functionality across hardware changes and software updates since its initial release in 1991. *(computing)*

## Used by
- [degree](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-degree.measurement) (L13)
- [drug](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-drug.chemical) (L13)
- [fluid](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-fluid.liquid) (L13)
- [gas](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-gas.state) (L13)
- [gold](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-gold.metal) (L23)
- [hard](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-hard.difficulty) (L13)
- [jewelry](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-jewelry.accessory) (L14)
- [liquid](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-liquid.state) (L15)
- [log](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-log.material) (L13)
- [metal](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-metal.element) (L13)
- [oil](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-oil.fuel) (L16)
- [resource](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-resource.material) (L15)
- [rock](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-rock.material) (L14)
- [toys](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-toys.play) (L14)
- [treatment](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-treatment.medical) (L13)

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