# PSA (pressure swing adsorption)

Separates oxygen from air: a molecular sieve holds back nitrogen under pressure and releases it when the pressure drops. The process inside ULTRAOX.

## Sources

- [Ultra Controlo, Medical gas answers: glossary](https://www.ultracontrolo.com/medical-gas-answers#term-psa)

Reviewed: 2026-10-22. Ultra Controlo engineering. https://library.ultracontrolo.com/glossary/psa/