# isentropic exponent

> the negative of the relative pressure change per relative volume change at constant entropy; for an ideal gas equal to the ratio of specific heat capacities

**Wikidata**: [Q75775739](https://www.wikidata.org/wiki/Q75775739)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Isentropic_exponent)  
**Source**: https://4ort.xyz/entity/isentropic-exponent


## References

1. ISO 80000-5:2007 Quantities and units — Part 5: Thermodynamics
2. ISO 80000-5:2019 Quantities and units — Part 5: Thermodynamics