Convert ppb per kelvin to Millimetres per metre per degree Celsius
Convert ppb per kelvin (ppb/K) to Millimetres per metre per degree Celsius (mm/(m·°C)) instantly and accurately.
Conversion Formula
mm/(m·°C) = ppb/K × 1.000000000e-6
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.
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).
Quick Reference Table
| ppb per kelvin (ppb/K) | Millimetres per metre per degree Celsius (mm/(m·°C)) |
|---|---|
| 1 ppb/K | 1 × 10-6 mm/(m·°C) |
| 2 ppb/K | 2 × 10-6 mm/(m·°C) |
| 5 ppb/K | 5 × 10-6 mm/(m·°C) |
| 10 ppb/K | 1 × 10-5 mm/(m·°C) |
| 25 ppb/K | 2.5 × 10-5 mm/(m·°C) |
| 50 ppb/K | 5 × 10-5 mm/(m·°C) |
| 100 ppb/K | 1 × 10-4 mm/(m·°C) |