Convert Technical Atmospheres to Inches of Mercury
Convert Technical Atmospheres (at) to Inches of Mercury (inHg) instantly and accurately.
Conversion Formula
inHg = at × 28.95902107
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 Inches of Mercury
One inch of mercury (inHg) ≈ 3,386 Pa - the primary barometric pressure unit in US aviation and meteorology. ASOS weather stations, METARs, and altimeter settings in the US report in inHg. Standard sea-level pressure is 29.92 inHg. Altimeters are set to local QNH in inHg to maintain altitude reference. US barometers for home weather stations display inHg. Typical pressure range: 28.5-31.0 inHg in continental weather systems. Record low: ~25.70 inHg (Typhoon Tip, 1979). 1 inHg = 3,386.39 Pa.
Quick Reference Table
| Technical Atmospheres (at) | Inches of Mercury (inHg) |
|---|---|
| 1 at | 28.959 inHg |
| 2 at | 57.918 inHg |
| 5 at | 144.795 inHg |
| 10 at | 289.59 inHg |
| 25 at | 723.976 inHg |
| 50 at | 1447.95 inHg |
| 100 at | 2895.9 inHg |