Convert Technical Atmospheres to Centimeters of Water
Convert Technical Atmospheres (at) to Centimeters of Water (cmH₂O) instantly and accurately.
Conversion Formula
cmH₂O = at × 1000
About Technical Atmospheres
One technical atmosphere (at) = exactly 1 kgf/cm² = 98,066.5 Pa ≈ 0.968 standard atmospheres. The metric technical pressure unit used in pre-SI European and Japanese engineering for boilers, hydraulic cylinders, and compressed gas systems. A steam boiler at 10 at operates at 0.981 MPa; hydraulic presses are rated at 200-600 at. Still used parenthetically in old German and Japanese machinery manuals and standards (DIN 1301-3 legacy). Converts simply from kgf/cm²: 1 at ≡ 1 kgf/cm². 1 at = 98,066.5 Pa.
About Centimeters of Water
One centimetre of water column (cmH₂O) ≈ 98.07 Pa - the clinical pressure unit for respiratory and intravascular measurements. Mechanical ventilator settings are in cmH₂O: peak inspiratory pressure (PIP) 15-30 cmH₂O; PEEP 5-15 cmH₂O; plateau pressure should stay below 30 cmH₂O to avoid lung injury. Lumbar puncture CSF opening pressure is normally 8-20 cmH₂O. CPAP/BiPAP therapy for sleep apnea: 4-20 cmH₂O. Central venous pressure is also reported in cmH₂O. 1 cmH₂O = 98.0665 Pa.
Quick Reference Table
| Technical Atmospheres (at) | Centimeters of Water (cmH₂O) |
|---|---|
| 1 at | 1000 cmH₂O |
| 2 at | 2000 cmH₂O |
| 5 at | 5000 cmH₂O |
| 10 at | 10000 cmH₂O |
| 25 at | 25000 cmH₂O |
| 50 at | 50000 cmH₂O |
| 100 at | 100000 cmH₂O |