Convert Percent per degree Fahrenheit to ppb per kelvin
Convert Percent per degree Fahrenheit (%/°F) to ppb per kelvin (ppb/K) instantly and accurately.
Conversion Formula
ppb/K = %/°F × 18000000
About Percent per degree Fahrenheit
The %/°F equals 9/5 × 10⁻² /K ≈ 0.018 /K, the Fahrenheit percent-expansion unit used in US polymer and rubber industry specifications. PTFE: ≈0.0075 %/°F; HDPE: ≈0.0083 %/°F; silicone rubber: ≈0.056 %/°F. 1 %/°F = 9/5 × 10⁻² /K ≈1.8 %/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
| Percent per degree Fahrenheit (%/°F) | ppb per kelvin (ppb/K) |
|---|---|
| 1 %/°F | 18000000 ppb/K |
| 2 %/°F | 36000000 ppb/K |
| 5 %/°F | 90000000 ppb/K |
| 10 %/°F | 180000000 ppb/K |
| 25 %/°F | 450000000 ppb/K |
| 50 %/°F | 900000000 ppb/K |
| 100 %/°F | 1.8 × 109 ppb/K |