Convert Per degree Fahrenheit to ppb per kelvin
Convert Per degree Fahrenheit (1/°F) to ppb per kelvin (ppb/K) instantly and accurately.
Conversion Formula
ppb/K = 1/°F × 1800000000
About Per degree Fahrenheit
The per degree Fahrenheit (1/°F = °F⁻¹) equals exactly 9/5 /K = 1.8 /K and is the imperial counterpart of the SI unit. Found in ASME boiler and pressure vessel codes, ASHRAE engineering tables, and UL material data sheets. Iron: ≈6.7 × 10⁻⁶ /°F; ordinary glass: ≈4.9 × 10⁻⁶ /°F. 1 /°F = 9/5 /K (= 1/°R).
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
| Per degree Fahrenheit (1/°F) | ppb per kelvin (ppb/K) |
|---|---|
| 1 1/°F | 1.8 × 109 ppb/K |
| 2 1/°F | 3.6 × 109 ppb/K |
| 5 1/°F | 9 × 109 ppb/K |
| 10 1/°F | 1.8 × 1010 ppb/K |
| 25 1/°F | 4.5 × 1010 ppb/K |
| 50 1/°F | 9 × 1010 ppb/K |
| 100 1/°F | 1.8 × 1011 ppb/K |