Convert Centimeters of Mercury to Micropascals
Convert Centimeters of Mercury (cmHg) to Micropascals (µPa) instantly and accurately.
Conversion Formula
µPa = cmHg × 1333223874
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 Micropascals
A micropascal (µPa) is 10⁻⁶ Pa - the standard reference unit for sound pressure levels in acoustics. The threshold of human hearing in air is 20 µPa, which defines 0 dB SPL; underwater acoustics uses 1 µPa as its reference (0 dB re 1 µPa). Blue whale calls reach ~189 dB re 1 µPa at source. Industrial noise regulations, architectural acoustics, and loudspeaker sensitivity specifications all trace back to µPa reference levels. Solar wind pressure near Earth averages ~1-6 nPa, rising to hundreds of µPa during major solar storms. 1 µPa = 10⁻⁶ Pa.
Quick Reference Table
| Centimeters of Mercury (cmHg) | Micropascals (µPa) |
|---|---|
| 1 cmHg | 1.333 × 109 µPa |
| 2 cmHg | 2.666 × 109 µPa |
| 5 cmHg | 6.666 × 109 µPa |
| 10 cmHg | 1.333 × 1010 µPa |
| 25 cmHg | 3.333 × 1010 µPa |
| 50 cmHg | 6.666 × 1010 µPa |
| 100 cmHg | 1.333 × 1011 µPa |