Convert ppb per degree Fahrenheit to Millimetres per metre per kelvin
Convert ppb per degree Fahrenheit (ppb/°F) to Millimetres per metre per kelvin (mm/(m·K)) instantly and accurately.
Conversion Formula
mm/(m·K) = ppb/°F × 1.800000000e-6
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.
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
| ppb per degree Fahrenheit (ppb/°F) | Millimetres per metre per kelvin (mm/(m·K)) |
|---|---|
| 1 ppb/°F | 1.8 × 10-6 mm/(m·K) |
| 2 ppb/°F | 3.6 × 10-6 mm/(m·K) |
| 5 ppb/°F | 9 × 10-6 mm/(m·K) |
| 10 ppb/°F | 1.8 × 10-5 mm/(m·K) |
| 25 ppb/°F | 4.5 × 10-5 mm/(m·K) |
| 50 ppb/°F | 9 × 10-5 mm/(m·K) |
| 100 ppb/°F | 0.00018 mm/(m·K) |