Convert Millibars to Technical Atmospheres
Convert Millibars (mbar) to Technical Atmospheres (at) instantly and accurately.
Conversion Formula
at = mbar × 0.001019716213
About Millibars
A millibar (mbar) = 100 Pa = 1 hPa - the historically dominant meteorological pressure unit. Standard sea-level pressure is 1013.25 mbar. Hurricane intensity is characterised by central pressure: Category 5 storms typically below 920 mbar (US record: 892 mbar, 1935). Upper-air analysis levels - 850, 700, 500, 300, 200 mbar - appear throughout decades of archived meteorological data. Aircraft cabins are pressurised to ~750-800 mbar at cruise altitude. 'Weather bombs' see pressure fall 24+ mbar in 24 hours. 1 mbar = 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
| Millibars (mbar) | Technical Atmospheres (at) |
|---|---|
| 1 mbar | 0.00101972 at |
| 2 mbar | 0.00203943 at |
| 5 mbar | 0.00509858 at |
| 10 mbar | 0.0101972 at |
| 25 mbar | 0.0254929 at |
| 50 mbar | 0.0509858 at |
| 100 mbar | 0.101972 at |