Convert ppb per degree Fahrenheit to ppb per kelvin
Convert ppb per degree Fahrenheit (ppb/°F) to ppb per kelvin (ppb/K) instantly and accurately.
Conversion Formula
ppb/K = ppb/°F × 1.8
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 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
| ppb per degree Fahrenheit (ppb/°F) | ppb per kelvin (ppb/K) |
|---|---|
| 1 ppb/°F | 1.8 ppb/K |
| 2 ppb/°F | 3.6 ppb/K |
| 5 ppb/°F | 9 ppb/K |
| 10 ppb/°F | 18 ppb/K |
| 25 ppb/°F | 45 ppb/K |
| 50 ppb/°F | 90 ppb/K |
| 100 ppb/°F | 180 ppb/K |