Convert Microns per metre per degree Celsius to ppb per kelvin
Convert Microns per metre per degree Celsius (μm/(m·°C)) to ppb per kelvin (ppb/K) instantly and accurately.
Conversion Formula
ppb/K = μm/(m·°C) × 1000
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 kelvin
The ppb/K (parts per billion per kelvin) equals 10⁻⁹ /K and is the resolution unit for ultra-low-CTE materials. Zerodur Class 0 (±0.02 ppb/K) and ULE titanium-silicate glass (±0.03 ppb/K) at 20 °C are characterised in ppb/K for gravitational-wave interferometers and space telescope optical benches. 1 ppb/K = 10⁻⁹ /K = 10⁻³ ppm/K.
Quick Reference Table
| Microns per metre per degree Celsius (μm/(m·°C)) | ppb per kelvin (ppb/K) |
|---|---|
| 1 μm/(m·°C) | 1000 ppb/K |
| 2 μm/(m·°C) | 2000 ppb/K |
| 5 μm/(m·°C) | 5000 ppb/K |
| 10 μm/(m·°C) | 10000 ppb/K |
| 25 μm/(m·°C) | 25000 ppb/K |
| 50 μm/(m·°C) | 50000 ppb/K |
| 100 μm/(m·°C) | 100000 ppb/K |