Convert Microinches per inch per degree Fahrenheit to Millimetres per metre per degree Celsius
Convert Microinches per inch per degree Fahrenheit (μin/(in·°F)) to Millimetres per metre per degree Celsius (mm/(m·°C)) instantly and accurately.
Conversion Formula
mm/(m·°C) = 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 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
| Microinches per inch per degree Fahrenheit (μin/(in·°F)) | Millimetres per metre per degree Celsius (mm/(m·°C)) |
|---|---|
| 1 μin/(in·°F) | 0.0018 mm/(m·°C) |
| 2 μin/(in·°F) | 0.0036 mm/(m·°C) |
| 5 μin/(in·°F) | 0.009 mm/(m·°C) |
| 10 μin/(in·°F) | 0.018 mm/(m·°C) |
| 25 μin/(in·°F) | 0.045 mm/(m·°C) |
| 50 μin/(in·°F) | 0.09 mm/(m·°C) |
| 100 μin/(in·°F) | 0.18 mm/(m·°C) |