Convert ppm per degree Fahrenheit to Per degree Fahrenheit
Convert ppm per degree Fahrenheit (ppm/°F) to Per degree Fahrenheit (1/°F) instantly and accurately.
Conversion Formula
1/°F = ppm/°F × 1.000000000e-6
About ppm per degree Fahrenheit
The ppm/°F (= μin/(in·°F) exactly) equals 9/5 × 10⁻⁶ /K ≈1.8 × 10⁻⁶ /K and is the dominant CTE unit in US ASTM standards, ASME piping codes, and mechanical engineering handbooks. Steel ≈6.7 ppm/°F; aluminium ≈12.8 ppm/°F; copper ≈9.4 ppm/°F. 1 ppm/°F = 9/5 × 10⁻⁶ /K.
About Per degree Fahrenheit
The per degree Fahrenheit (1/°F = °F⁻¹) equals exactly 9/5 /K = 1.8 /K and is the imperial counterpart of the SI unit. Found in ASME boiler and pressure vessel codes, ASHRAE engineering tables, and UL material data sheets. Iron: ≈6.7 × 10⁻⁶ /°F; ordinary glass: ≈4.9 × 10⁻⁶ /°F. 1 /°F = 9/5 /K (= 1/°R).
Quick Reference Table
| ppm per degree Fahrenheit (ppm/°F) | Per degree Fahrenheit (1/°F) |
|---|---|
| 1 ppm/°F | 1 × 10-6 1/°F |
| 2 ppm/°F | 2 × 10-6 1/°F |
| 5 ppm/°F | 5 × 10-6 1/°F |
| 10 ppm/°F | 1 × 10-5 1/°F |
| 25 ppm/°F | 2.5 × 10-5 1/°F |
| 50 ppm/°F | 5 × 10-5 1/°F |
| 100 ppm/°F | 1 × 10-4 1/°F |