Convert ppm per kelvin to ppm per degree Fahrenheit
Convert ppm per kelvin (ppm/K) to ppm per degree Fahrenheit (ppm/°F) instantly and accurately.
Conversion Formula
ppm/°F = ppm/K × 0.5555555556
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 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.
Quick Reference Table
| ppm per kelvin (ppm/K) | ppm per degree Fahrenheit (ppm/°F) |
|---|---|
| 1 ppm/K | 0.555556 ppm/°F |
| 2 ppm/K | 1.11111 ppm/°F |
| 5 ppm/K | 2.77778 ppm/°F |
| 10 ppm/K | 5.55556 ppm/°F |
| 25 ppm/K | 13.8889 ppm/°F |
| 50 ppm/K | 27.7778 ppm/°F |
| 100 ppm/K | 55.5556 ppm/°F |