Convert Percent per degree Fahrenheit to Millimetres per metre per degree Celsius
Convert Percent per degree Fahrenheit (%/°F) to Millimetres per metre per degree Celsius (mm/(m·°C)) instantly and accurately.
Conversion Formula
mm/(m·°C) = %/°F × 18
About Percent per degree Fahrenheit
The %/°F equals 9/5 × 10⁻² /K ≈ 0.018 /K, the Fahrenheit percent-expansion unit used in US polymer and rubber industry specifications. PTFE: ≈0.0075 %/°F; HDPE: ≈0.0083 %/°F; silicone rubber: ≈0.056 %/°F. 1 %/°F = 9/5 × 10⁻² /K ≈1.8 %/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
| Percent per degree Fahrenheit (%/°F) | Millimetres per metre per degree Celsius (mm/(m·°C)) |
|---|---|
| 1 %/°F | 18 mm/(m·°C) |
| 2 %/°F | 36 mm/(m·°C) |
| 5 %/°F | 90 mm/(m·°C) |
| 10 %/°F | 180 mm/(m·°C) |
| 25 %/°F | 450 mm/(m·°C) |
| 50 %/°F | 900 mm/(m·°C) |
| 100 %/°F | 1800 mm/(m·°C) |