Convert ppm per degree Fahrenheit to Microns per metre per degree Celsius
Convert ppm per degree Fahrenheit (ppm/°F) to Microns per metre per degree Celsius (μm/(m·°C)) instantly and accurately.
Conversion Formula
μm/(m·°C) = ppm/°F × 1.8
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 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.
Quick Reference Table
| ppm per degree Fahrenheit (ppm/°F) | Microns per metre per degree Celsius (μm/(m·°C)) |
|---|---|
| 1 ppm/°F | 1.8 μm/(m·°C) |
| 2 ppm/°F | 3.6 μm/(m·°C) |
| 5 ppm/°F | 9 μm/(m·°C) |
| 10 ppm/°F | 18 μm/(m·°C) |
| 25 ppm/°F | 45 μm/(m·°C) |
| 50 ppm/°F | 90 μm/(m·°C) |
| 100 ppm/°F | 180 μm/(m·°C) |