Standards knowledge center

ATA: definition

Direct answer: Atmospheres absolute, a pressure unit measured relative to a vacuum. One ATA is approximately the average pressure of Earth's atmosphere at sea level.

This formal term definition is educational context and not a product-specific legal, regulatory, or engineering determination.

Editorial disclosure: Educational information only; not legal, medical, regulatory, or engineering advice. Published with the Standards Knowledge Center; last reviewed 2026-08-20.

Review primary sources · Editorial policy and corrections