Convert Micropascals to Technical Atmospheres
Convert Micropascals (µPa) to Technical Atmospheres (at) instantly and accurately.
Conversion Formula
at = µPa × 1.019716213e-11
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.
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
| Micropascals (µPa) | Technical Atmospheres (at) |
|---|---|
| 1 µPa | 1.02 × 10-11 at |
| 2 µPa | 2.039 × 10-11 at |
| 5 µPa | 5.099 × 10-11 at |
| 10 µPa | 1.02 × 10-10 at |
| 25 µPa | 2.549 × 10-10 at |
| 50 µPa | 5.099 × 10-10 at |
| 100 µPa | 1.02 × 10-9 at |