Convert Microns per metre per degree Celsius to ppb per degree Fahrenheit
Convert Microns per metre per degree Celsius (μm/(m·°C)) to ppb per degree Fahrenheit (ppb/°F) instantly and accurately.
Conversion Formula
ppb/°F = μm/(m·°C) × 555.5555556
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 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
| Microns per metre per degree Celsius (μm/(m·°C)) | ppb per degree Fahrenheit (ppb/°F) |
|---|---|
| 1 μm/(m·°C) | 555.556 ppb/°F |
| 2 μm/(m·°C) | 1111.11 ppb/°F |
| 5 μm/(m·°C) | 2777.78 ppb/°F |
| 10 μm/(m·°C) | 5555.56 ppb/°F |
| 25 μm/(m·°C) | 13888.9 ppb/°F |
| 50 μm/(m·°C) | 27777.8 ppb/°F |
| 100 μm/(m·°C) | 55555.6 ppb/°F |