Convert ppm per kelvin to Millimetres per metre per degree Celsius
Convert ppm per kelvin (ppm/K) to Millimetres per metre per degree Celsius (mm/(m·°C)) instantly and accurately.
Conversion Formula
mm/(m·°C) = 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 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
| ppm per kelvin (ppm/K) | Millimetres per metre per degree Celsius (mm/(m·°C)) |
|---|---|
| 1 ppm/K | 0.001 mm/(m·°C) |
| 2 ppm/K | 0.002 mm/(m·°C) |
| 5 ppm/K | 0.005 mm/(m·°C) |
| 10 ppm/K | 0.01 mm/(m·°C) |
| 25 ppm/K | 0.025 mm/(m·°C) |
| 50 ppm/K | 0.05 mm/(m·°C) |
| 100 ppm/K | 0.1 mm/(m·°C) |