Convert Microinches per inch per degree Fahrenheit to Millimetres per metre per kelvin
Convert Microinches per inch per degree Fahrenheit (μin/(in·°F)) to Millimetres per metre per kelvin (mm/(m·K)) instantly and accurately.
Conversion Formula
mm/(m·K) = μin/(in·°F) × 0.0018
About Microinches per inch per degree Fahrenheit
The microinch per inch per degree Fahrenheit (μin/(in·°F)) equals exactly 9/5 × 10⁻⁶ /K = 1 ppm/°F. It is the native US CTE unit in ASTM E228 and ASTM E831 standards; most US material datasheets list CTE values in this unit. Steel: ≈6.7 μin/(in·°F); aluminium: ≈12.8 μin/(in·°F); titanium: ≈4.9 μin/(in·°F). 1 μin/(in·°F) = 1 ppm/°F.
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
| Microinches per inch per degree Fahrenheit (μin/(in·°F)) | Millimetres per metre per kelvin (mm/(m·K)) |
|---|---|
| 1 μin/(in·°F) | 0.0018 mm/(m·K) |
| 2 μin/(in·°F) | 0.0036 mm/(m·K) |
| 5 μin/(in·°F) | 0.009 mm/(m·K) |
| 10 μin/(in·°F) | 0.018 mm/(m·K) |
| 25 μin/(in·°F) | 0.045 mm/(m·K) |
| 50 μin/(in·°F) | 0.09 mm/(m·K) |
| 100 μin/(in·°F) | 0.18 mm/(m·K) |