Convert Millimetres per metre per degree Celsius to ppm per kelvin
Convert Millimetres per metre per degree Celsius (mm/(m·°C)) to ppm per kelvin (ppm/K) instantly and accurately.
Conversion Formula
ppm/K = mm/(m·°C) × 1000
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 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.
Quick Reference Table
| Millimetres per metre per degree Celsius (mm/(m·°C)) | ppm per kelvin (ppm/K) |
|---|---|
| 1 mm/(m·°C) | 1000 ppm/K |
| 2 mm/(m·°C) | 2000 ppm/K |
| 5 mm/(m·°C) | 5000 ppm/K |
| 10 mm/(m·°C) | 10000 ppm/K |
| 25 mm/(m·°C) | 25000 ppm/K |
| 50 mm/(m·°C) | 50000 ppm/K |
| 100 mm/(m·°C) | 100000 ppm/K |