Convert ppb per kelvin to Microinches per inch per degree Fahrenheit
Convert ppb per kelvin (ppb/K) to Microinches per inch per degree Fahrenheit (μin/(in·°F)) instantly and accurately.
Conversion Formula
μin/(in·°F) = ppb/K × 0.0005555555556
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.
About Microinches per inch per degree Fahrenheit
The microinch per inch per degree Fahrenheit (μin/(in·°F)) equals exactly 9/5 × 10⁻⁶ /K = 1 ppm/°F. It is the native US CTE unit in ASTM E228 and ASTM E831 standards; most US material datasheets list CTE values in this unit. Steel: ≈6.7 μin/(in·°F); aluminium: ≈12.8 μin/(in·°F); titanium: ≈4.9 μin/(in·°F). 1 μin/(in·°F) = 1 ppm/°F.
Quick Reference Table
| ppb per kelvin (ppb/K) | Microinches per inch per degree Fahrenheit (μin/(in·°F)) |
|---|---|
| 1 ppb/K | 0.000555556 μin/(in·°F) |
| 2 ppb/K | 0.00111111 μin/(in·°F) |
| 5 ppb/K | 0.00277778 μin/(in·°F) |
| 10 ppb/K | 0.00555556 μin/(in·°F) |
| 25 ppb/K | 0.0138889 μin/(in·°F) |
| 50 ppb/K | 0.0277778 μin/(in·°F) |
| 100 ppb/K | 0.0555556 μin/(in·°F) |