Convert ppm per degree Fahrenheit to ppb per degree Fahrenheit
Convert ppm per degree Fahrenheit (ppm/°F) to ppb per degree Fahrenheit (ppb/°F) instantly and accurately.
Conversion Formula
ppb/°F = ppm/°F × 1000
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 ppb per degree Fahrenheit
The ppb/°F equals 9/5 × 10⁻⁹ /K ≈1.8 × 10⁻⁹ /K, the Fahrenheit counterpart of ppb/K. Used when ultra-low-expansion glass ceramics are characterised in US laboratories using Fahrenheit protocols. Zerodur at ±0.02 ppb/K ≈ ±0.011 ppb/°F. 1 ppb/°F = 9/5 × 10⁻⁹ /K ≈1.8 ppb/K.
Quick Reference Table
| ppm per degree Fahrenheit (ppm/°F) | ppb per degree Fahrenheit (ppb/°F) |
|---|---|
| 1 ppm/°F | 1000 ppb/°F |
| 2 ppm/°F | 2000 ppb/°F |
| 5 ppm/°F | 5000 ppb/°F |
| 10 ppm/°F | 10000 ppb/°F |
| 25 ppm/°F | 25000 ppb/°F |
| 50 ppm/°F | 50000 ppb/°F |
| 100 ppm/°F | 100000 ppb/°F |