Convert Millimetres per metre per degree Fahrenheit to ppb per kelvin
Convert Millimetres per metre per degree Fahrenheit (mm/(m·°F)) to ppb per kelvin (ppb/K) instantly and accurately.
Conversion Formula
ppb/K = mm/(m·°F) × 1800000
About Millimetres per metre per degree Fahrenheit
The mm/(m·°F) equals 9/5 × 10⁻³ /K ≈1.8 × 10⁻³ /K, combining metric displacement with Fahrenheit temperature. It appears in US-origin pipeline and structural reports where dimensions are given in metres but temperatures in °F. Steel: ≈0.00667 mm/(m·°F); aluminium: ≈0.01283 mm/(m·°F). 1 mm/(m·°F) = 9/5 × 10⁻³ /K.
About ppb per kelvin
The ppb/K (parts per billion per kelvin) equals 10⁻⁹ /K and is the resolution unit for ultra-low-CTE materials. Zerodur Class 0 (±0.02 ppb/K) and ULE titanium-silicate glass (±0.03 ppb/K) at 20 °C are characterised in ppb/K for gravitational-wave interferometers and space telescope optical benches. 1 ppb/K = 10⁻⁹ /K = 10⁻³ ppm/K.
Quick Reference Table
| Millimetres per metre per degree Fahrenheit (mm/(m·°F)) | ppb per kelvin (ppb/K) |
|---|---|
| 1 mm/(m·°F) | 1800000 ppb/K |
| 2 mm/(m·°F) | 3600000 ppb/K |
| 5 mm/(m·°F) | 9000000 ppb/K |
| 10 mm/(m·°F) | 18000000 ppb/K |
| 25 mm/(m·°F) | 45000000 ppb/K |
| 50 mm/(m·°F) | 90000000 ppb/K |
| 100 mm/(m·°F) | 180000000 ppb/K |