# per (ratio)

for each

- Computed level: L2 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: ratio  ·  Arena: per

## Emergence
**Emerges from:** [part](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-part.relation), [regular](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-regular.frequency)

**Through:** each part of a thing is with a thing and the pattern is again

**Novel properties:**
- pairwise assignment
- uniform ratio
- consistent scaling

## Examples
- A car's fuel efficiency is 25 miles per gallon, measured in real-world driving tests by the EPA. *(engineering)*
- The minimum wage in California was $15 per hour for all employers as of 2022. *(economics)*
- Neurons in the visual cortex fire 30 times per second when exposed to flashing light at 10 Hz in macaque monkeys. *(biology)*

## Used by
- [average](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-average.statistical) (L9)
- [discount](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-discount.economic) (L9)
- [meters](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-meters.measurement) (L15)
- [speed](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-speed.motion) (L6)
- [statistics](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-statistics.data) (L8)

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