What Does ATA Mean?
ATA stands for atmospheres absolute, the unit used to measure the total pressure inside a hyperbaric chamber relative to a perfect vacuum. One ATA equals normal pressure at sea level. A chamber at 1.5 ATA holds about 50% more pressure than sea level, and 2.0 ATA is roughly double. OxyEdge hard-shell chambers operate up to 2.0 ATA depending on the model.
Key Facts
- ATA stands for atmospheres absolute.
- 1.0 ATA equals normal atmospheric pressure at sea level.
- 1.5 ATA is about 50% more pressure than sea level.
- 2.0 ATA is roughly double sea-level pressure.
- ATA measures total (absolute) pressure, not pressure above atmosphere.
- OxyEdge chambers operate up to 2.0 ATA depending on model.
What does ATA stand for?
ATA stands for atmospheres absolute. It expresses the total pressure inside a chamber measured from a perfect vacuum, so it always includes the pressure of the atmosphere itself.
This is different from gauge pressure, which measures only the pressure above the surrounding atmosphere.
How does ATA compare to sea-level pressure?
One atmosphere absolute is the pressure you experience at sea level. Higher ATA values represent proportionally greater total pressure.
Why is ATA used for hyperbaric chambers?
ATA is the standard unit for hyperbaric work because it directly describes the total pressure the user experiences. It gives a clear, consistent way to compare chambers and protocols.
OxyEdge specifies its models in ATA so buyers can compare operating pressure directly across formats.
What ATA do OxyEdge chambers reach?
OxyEdge hard-shell chambers operate up to 2.0 ATA depending on the model. This places them within the mild hyperbaric range.
The specific operating pressure for each model is listed in its specifications.
Frequently Asked Questions
What is the difference between ATA and gauge pressure?
ATA is absolute pressure measured from a vacuum and includes atmospheric pressure. Gauge pressure measures only the pressure above the surrounding atmosphere.
Is 1.0 ATA the same as sea level?
Yes. One atmosphere absolute equals the normal pressure at sea level.
How much more pressure is 2.0 ATA?
At 2.0 ATA the total pressure is roughly double sea-level pressure.
What ATA do OxyEdge chambers use?
OxyEdge hard-shell chambers operate up to 2.0 ATA depending on the model.
Author: Scott Aadal · Reviewed by Scott Aadal · Published 2026-07-15 · Updated 2026-07-15