Convert Millimetres per metre per degree Celsius to ppb per kelvin
Convert Millimetres per metre per degree Celsius (mm/(m·°C)) to ppb per kelvin (ppb/K) instantly and accurately.
Conversion Formula
ppb/K = mm/(m·°C) × 1000000
About Millimetres per metre per degree Celsius
The millimetre per metre per degree Celsius (mm/(m·°C)) equals exactly 10⁻³ /K = 1 mm/(m·K), since temperature intervals 1 °C = 1 K (exact). Used in European structural engineering, EN standards, and civil/mechanical design codes for expansion joint sizing. Steel rail: 0.012 mm/(m·°C); aluminium curtain wall: 0.023 mm/(m·°C). 1 mm/(m·°C) = 10⁻³ /K = 1 mm/(m·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
| Millimetres per metre per degree Celsius (mm/(m·°C)) | ppb per kelvin (ppb/K) |
|---|---|
| 1 mm/(m·°C) | 1000000 ppb/K |
| 2 mm/(m·°C) | 2000000 ppb/K |
| 5 mm/(m·°C) | 5000000 ppb/K |
| 10 mm/(m·°C) | 10000000 ppb/K |
| 25 mm/(m·°C) | 25000000 ppb/K |
| 50 mm/(m·°C) | 50000000 ppb/K |
| 100 mm/(m·°C) | 100000000 ppb/K |