Convert Millimetres per metre per kelvin to ppb per degree Fahrenheit
Convert Millimetres per metre per kelvin (mm/(m·K)) to ppb per degree Fahrenheit (ppb/°F) instantly and accurately.
Conversion Formula
ppb/°F = mm/(m·K) × 555555.5556
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 ppb per degree Fahrenheit
The ppb/°F equals 9/5 × 10⁻⁹ /K ≈1.8 × 10⁻⁹ /K, the Fahrenheit counterpart of ppb/K. Used when ultra-low-expansion glass ceramics are characterised in US laboratories using Fahrenheit protocols. Zerodur at ±0.02 ppb/K ≈ ±0.011 ppb/°F. 1 ppb/°F = 9/5 × 10⁻⁹ /K ≈1.8 ppb/K.
Quick Reference Table
| Millimetres per metre per kelvin (mm/(m·K)) | ppb per degree Fahrenheit (ppb/°F) |
|---|---|
| 1 mm/(m·K) | 555556 ppb/°F |
| 2 mm/(m·K) | 1111110 ppb/°F |
| 5 mm/(m·K) | 2777780 ppb/°F |
| 10 mm/(m·K) | 5555560 ppb/°F |
| 25 mm/(m·K) | 13888900 ppb/°F |
| 50 mm/(m·K) | 27777800 ppb/°F |
| 100 mm/(m·K) | 55555600 ppb/°F |