Convert ppb per kelvin to Microns per metre per degree Celsius

Convert ppb per kelvin (ppb/K) to Microns per metre per degree Celsius (μm/(m·°C)) instantly and accurately.

ppb per kelvin (ppb/K)
Microns per metre per degree Celsius (μm/(m·°C))

Conversion Formula

μm/(m·°C) = 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 Microns per metre per degree Celsius

The micrometre per metre per degree Celsius (μm/(m·°C)) equals exactly 10⁻⁶ /K, since temperature intervals 1 °C = 1 K (exact). It is the standard CTE notation in European engineering datasheets, ISO material standards, and many textbooks. Numerically identical to ppm/K. Aluminium: 23.1 μm/(m·°C); steel: ≈12 μm/(m·°C). 1 μm/(m·°C) = 1 ppm/K = 10⁻⁶ /K.

Quick Reference Table

ppb per kelvin (ppb/K)Microns per metre per degree Celsius (μm/(m·°C))
1 ppb/K0.001 μm/(m·°C)
2 ppb/K0.002 μm/(m·°C)
5 ppb/K0.005 μm/(m·°C)
10 ppb/K0.01 μm/(m·°C)
25 ppb/K0.025 μm/(m·°C)
50 ppb/K0.05 μm/(m·°C)
100 ppb/K0.1 μm/(m·°C)

→ Full Thermal Expansion Converter