Convert ppm per kelvin to ppb per degree Fahrenheit
Convert ppm per kelvin (ppm/K) to ppb per degree Fahrenheit (ppb/°F) instantly and accurately.
Conversion Formula
ppb/°F = ppm/K × 555.5555556
About ppm per kelvin
The ppm/K (= μm/(m·K) exactly) equals 10⁻⁶ /K and is the universal CTE unit in international materials standards (ISO, EN, DIN). Aluminium: 23.1 ppm/K; steel: ≈12 ppm/K; ordinary glass: ≈9 ppm/K; fused silica: 0.55 ppm/K; Invar: ≈1.2 ppm/K. 1 ppm/K = 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 kelvin (ppm/K) | ppb per degree Fahrenheit (ppb/°F) |
|---|---|
| 1 ppm/K | 555.556 ppb/°F |
| 2 ppm/K | 1111.11 ppb/°F |
| 5 ppm/K | 2777.78 ppb/°F |
| 10 ppm/K | 5555.56 ppb/°F |
| 25 ppm/K | 13888.9 ppb/°F |
| 50 ppm/K | 27777.8 ppb/°F |
| 100 ppm/K | 55555.6 ppb/°F |