Convert Percent per degree Fahrenheit to Millimetres per metre per kelvin
Convert Percent per degree Fahrenheit (%/°F) to Millimetres per metre per kelvin (mm/(m·K)) instantly and accurately.
Conversion Formula
mm/(m·K) = %/°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 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
| Percent per degree Fahrenheit (%/°F) | Millimetres per metre per kelvin (mm/(m·K)) |
|---|---|
| 1 %/°F | 18 mm/(m·K) |
| 2 %/°F | 36 mm/(m·K) |
| 5 %/°F | 90 mm/(m·K) |
| 10 %/°F | 180 mm/(m·K) |
| 25 %/°F | 450 mm/(m·K) |
| 50 %/°F | 900 mm/(m·K) |
| 100 %/°F | 1800 mm/(m·K) |