Convert ppm per kelvin to Millimetres per metre per kelvin
Convert ppm per kelvin (ppm/K) to Millimetres per metre per kelvin (mm/(m·K)) instantly and accurately.
Conversion Formula
mm/(m·K) = ppm/K × 0.001
About ppm per kelvin
The ppm/K (= μm/(m·K) exactly) equals 10⁻⁶ /K and is the universal CTE unit in international materials standards (ISO, EN, DIN). Aluminium: 23.1 ppm/K; steel: ≈12 ppm/K; ordinary glass: ≈9 ppm/K; fused silica: 0.55 ppm/K; Invar: ≈1.2 ppm/K. 1 ppm/K = 10⁻⁶ /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
| ppm per kelvin (ppm/K) | Millimetres per metre per kelvin (mm/(m·K)) |
|---|---|
| 1 ppm/K | 0.001 mm/(m·K) |
| 2 ppm/K | 0.002 mm/(m·K) |
| 5 ppm/K | 0.005 mm/(m·K) |
| 10 ppm/K | 0.01 mm/(m·K) |
| 25 ppm/K | 0.025 mm/(m·K) |
| 50 ppm/K | 0.05 mm/(m·K) |
| 100 ppm/K | 0.1 mm/(m·K) |