Convert ppb per kelvin to Millimetres per metre per kelvin
Convert ppb per kelvin (ppb/K) to Millimetres per metre per kelvin (mm/(m·K)) instantly and accurately.
Conversion Formula
mm/(m·K) = 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 kelvin
The mm/(m·K) equals exactly 10⁻³ /K = 1000 ppm/K and is used in structural and civil engineering for bridge girder and pipeline thermal-expansion calculations. Steel at 0.012 mm/(m·K) expands 12 mm per 100 m track per 10 K rise. Polymers: 0.07-0.20 mm/(m·K). 1 mm/(m·K) = 10⁻³ /K = 1000 ppm/K.
Quick Reference Table
| ppb per kelvin (ppb/K) | Millimetres per metre per kelvin (mm/(m·K)) |
|---|---|
| 1 ppb/K | 1 × 10-6 mm/(m·K) |
| 2 ppb/K | 2 × 10-6 mm/(m·K) |
| 5 ppb/K | 5 × 10-6 mm/(m·K) |
| 10 ppb/K | 1 × 10-5 mm/(m·K) |
| 25 ppb/K | 2.5 × 10-5 mm/(m·K) |
| 50 ppb/K | 5 × 10-5 mm/(m·K) |
| 100 ppb/K | 1 × 10-4 mm/(m·K) |