Convert Hectopascals to Technical Atmospheres
Convert Hectopascals (hPa) to Technical Atmospheres (at) instantly and accurately.
Conversion Formula
at = hPa × 0.001019716213
About Hectopascals
A hectopascal (hPa) = 100 Pa = 1 mbar - the WMO-official SI-compatible meteorological pressure unit since 1986, replacing millibar with no numerical change. All modern surface observations (METAR, SYNOP), digital barometers, aviation weather, and weather apps report in hPa. QNH altimeter settings outside North America are in hPa. ICAO standard sea-level pressure is 1013.25 hPa. Continental high-pressure record exceeds 1084 hPa; Typhoon Tip (1979) holds the low record at ~870 hPa. 1 hPa = 100 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
| Hectopascals (hPa) | Technical Atmospheres (at) |
|---|---|
| 1 hPa | 0.00101972 at |
| 2 hPa | 0.00203943 at |
| 5 hPa | 0.00509858 at |
| 10 hPa | 0.0101972 at |
| 25 hPa | 0.0254929 at |
| 50 hPa | 0.0509858 at |
| 100 hPa | 0.101972 at |