Convert Microns per metre per degree Celsius to ppm per degree Fahrenheit
Convert Microns per metre per degree Celsius (μm/(m·°C)) to ppm per degree Fahrenheit (ppm/°F) instantly and accurately.
Conversion Formula
ppm/°F = μm/(m·°C) × 0.5555555556
About Microns per metre per degree Celsius
The micrometre per metre per degree Celsius (μm/(m·°C)) equals exactly 10⁻⁶ /K, since temperature intervals 1 °C = 1 K (exact). It is the standard CTE notation in European engineering datasheets, ISO material standards, and many textbooks. Numerically identical to ppm/K. Aluminium: 23.1 μm/(m·°C); steel: ≈12 μm/(m·°C). 1 μm/(m·°C) = 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
| Microns per metre per degree Celsius (μm/(m·°C)) | ppm per degree Fahrenheit (ppm/°F) |
|---|---|
| 1 μm/(m·°C) | 0.555556 ppm/°F |
| 2 μm/(m·°C) | 1.11111 ppm/°F |
| 5 μm/(m·°C) | 2.77778 ppm/°F |
| 10 μm/(m·°C) | 5.55556 ppm/°F |
| 25 μm/(m·°C) | 13.8889 ppm/°F |
| 50 μm/(m·°C) | 27.7778 ppm/°F |
| 100 μm/(m·°C) | 55.5556 ppm/°F |