Convert ppm per kelvin to ppb per kelvin
Convert ppm per kelvin (ppm/K) to ppb per kelvin (ppb/K) instantly and accurately.
Conversion Formula
ppb/K = ppm/K × 1000
About ppm per kelvin
The ppm/K (= μm/(m·K) exactly) equals 10⁻⁶ /K and is the universal CTE unit in international materials standards (ISO, EN, DIN). Aluminium: 23.1 ppm/K; steel: ≈12 ppm/K; ordinary glass: ≈9 ppm/K; fused silica: 0.55 ppm/K; Invar: ≈1.2 ppm/K. 1 ppm/K = 10⁻⁶ /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
| ppm per kelvin (ppm/K) | ppb per kelvin (ppb/K) |
|---|---|
| 1 ppm/K | 1000 ppb/K |
| 2 ppm/K | 2000 ppb/K |
| 5 ppm/K | 5000 ppb/K |
| 10 ppm/K | 10000 ppb/K |
| 25 ppm/K | 25000 ppb/K |
| 50 ppm/K | 50000 ppb/K |
| 100 ppm/K | 100000 ppb/K |