Convert ppb per degree Fahrenheit to Microns per metre per degree Celsius
Convert ppb per degree Fahrenheit (ppb/°F) to Microns per metre per degree Celsius (μm/(m·°C)) instantly and accurately.
Conversion Formula
μm/(m·°C) = ppb/°F × 0.0018
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.
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
| ppb per degree Fahrenheit (ppb/°F) | Microns per metre per degree Celsius (μm/(m·°C)) |
|---|---|
| 1 ppb/°F | 0.0018 μm/(m·°C) |
| 2 ppb/°F | 0.0036 μm/(m·°C) |
| 5 ppb/°F | 0.009 μm/(m·°C) |
| 10 ppb/°F | 0.018 μm/(m·°C) |
| 25 ppb/°F | 0.045 μm/(m·°C) |
| 50 ppb/°F | 0.09 μm/(m·°C) |
| 100 ppb/°F | 0.18 μm/(m·°C) |