Convert Centimeters of Mercury to Technical Atmospheres
Convert Centimeters of Mercury (cmHg) to Technical Atmospheres (at) instantly and accurately.
Conversion Formula
at = cmHg × 0.0135951
About Centimeters of Mercury
One centimetre of mercury (cmHg) = 10 mmHg ≈ 1,333.22 Pa. Historical medical and physiological literature used cmHg for intracardiac and intravascular pressures before mmHg became universal. Left ventricular systolic pressure ~12 cmHg; pulmonary artery systolic 2-3 cmHg. Some older European cardiological textbooks and pre-1970s surgical literature report pressures in cmHg. Central venous pressure, cerebral perfusion pressure, and intra-abdominal pressure are occasionally cited in cmHg in legacy datasets. 1 cmHg = 1,333.22 Pa.
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.
Quick Reference Table
| Centimeters of Mercury (cmHg) | Technical Atmospheres (at) |
|---|---|
| 1 cmHg | 0.0135951 at |
| 2 cmHg | 0.0271902 at |
| 5 cmHg | 0.0679755 at |
| 10 cmHg | 0.135951 at |
| 25 cmHg | 0.339877 at |
| 50 cmHg | 0.679755 at |
| 100 cmHg | 1.35951 at |