Convert ppb per kelvin to ppm per kelvin
Convert ppb per kelvin (ppb/K) to ppm per kelvin (ppm/K) instantly and accurately.
Conversion Formula
ppm/K = ppb/K × 0.001
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 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.
Quick Reference Table
| ppb per kelvin (ppb/K) | ppm per kelvin (ppm/K) |
|---|---|
| 1 ppb/K | 0.001 ppm/K |
| 2 ppb/K | 0.002 ppm/K |
| 5 ppb/K | 0.005 ppm/K |
| 10 ppb/K | 0.01 ppm/K |
| 25 ppb/K | 0.025 ppm/K |
| 50 ppb/K | 0.05 ppm/K |
| 100 ppb/K | 0.1 ppm/K |