# upper atmosphere

> region of the Earth's atmosphere in which air density or atmospheric pressure falls below a technically significant level

**Wikidata**: [Q1621662](https://www.wikidata.org/wiki/Q1621662)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Upper_atmosphere)  
**Source**: https://4ort.xyz/entity/upper-atmosphere


## References

1. [Nuovo soggettario](https://thes.bncf.firenze.sbn.it/termine.php?id=65494)
2. Integrated Authority File