Convert Centimeters of Mercury to Nanopascals
Convert Centimeters of Mercury (cmHg) to Nanopascals (nPa) instantly and accurately.
Conversion Formula
nPa = cmHg × 1333223874000
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 Nanopascals
A nanopascal (nPa) is 10⁻⁹ Pa - the pressure scale of deep interplanetary space. LIGO and Virgo gravitational wave detectors must isolate mirror displacement signals against noise floors in the nanopascal regime. Low Earth orbit residual atmosphere is ~100 µPa; deep interplanetary space is ~1-10 nPa depending on solar wind activity. Thermospheric gas layers above 200 km altitude fall into the nPa-µPa range. Casimir force calculations and quantum vacuum fluctuation modelling also operate at nanopascal scales. 1 nPa = 10⁻⁹ Pa.
Quick Reference Table
| Centimeters of Mercury (cmHg) | Nanopascals (nPa) |
|---|---|
| 1 cmHg | 1.333 × 1012 nPa |
| 2 cmHg | 2.666 × 1012 nPa |
| 5 cmHg | 6.666 × 1012 nPa |
| 10 cmHg | 1.333 × 1013 nPa |
| 25 cmHg | 3.333 × 1013 nPa |
| 50 cmHg | 6.666 × 1013 nPa |
| 100 cmHg | 1.333 × 1014 nPa |