Convert Millimetres per metre per kelvin to ppm per degree Fahrenheit
Convert Millimetres per metre per kelvin (mm/(m·K)) to ppm per degree Fahrenheit (ppm/°F) instantly and accurately.
Conversion Formula
ppm/°F = mm/(m·K) × 555.5555556
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.
About ppm per degree Fahrenheit
The ppm/°F (= μin/(in·°F) exactly) equals 9/5 × 10⁻⁶ /K ≈1.8 × 10⁻⁶ /K and is the dominant CTE unit in US ASTM standards, ASME piping codes, and mechanical engineering handbooks. Steel ≈6.7 ppm/°F; aluminium ≈12.8 ppm/°F; copper ≈9.4 ppm/°F. 1 ppm/°F = 9/5 × 10⁻⁶ /K.
Quick Reference Table
| Millimetres per metre per kelvin (mm/(m·K)) | ppm per degree Fahrenheit (ppm/°F) |
|---|---|
| 1 mm/(m·K) | 555.556 ppm/°F |
| 2 mm/(m·K) | 1111.11 ppm/°F |
| 5 mm/(m·K) | 2777.78 ppm/°F |
| 10 mm/(m·K) | 5555.56 ppm/°F |
| 25 mm/(m·K) | 13888.9 ppm/°F |
| 50 mm/(m·K) | 27777.8 ppm/°F |
| 100 mm/(m·K) | 55555.6 ppm/°F |