Convert Centimeters of Water to Torr
Convert Centimeters of Water (cmH₂O) to Torr (Torr) instantly and accurately.
Conversion Formula
Torr = cmH₂O × 0.7355592401
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.
About Torr
The torr is defined as exactly 1/760 of a standard atmosphere ≈ 133.322 Pa - effectively replacing mmHg with an exact definition. Named after Evangelista Torricelli (1608-1647), inventor of the barometer. Vacuum science universally uses torr: rough vacuum 760-1 torr; medium vacuum 1-10⁻³ torr; high vacuum 10⁻³-10⁻⁷ torr; ultra-high vacuum below 10⁻⁹ torr. UHV systems for surface science, particle accelerator beam tubes, and space simulation chambers reach 10⁻¹¹-10⁻¹² torr. 1 torr = 133.322 Pa.
Quick Reference Table
| Centimeters of Water (cmH₂O) | Torr (Torr) |
|---|---|
| 1 cmH₂O | 0.735559 Torr |
| 2 cmH₂O | 1.47112 Torr |
| 5 cmH₂O | 3.6778 Torr |
| 10 cmH₂O | 7.35559 Torr |
| 25 cmH₂O | 18.389 Torr |
| 50 cmH₂O | 36.778 Torr |
| 100 cmH₂O | 73.5559 Torr |