ppm/K
Parts per million per kelvin (ppm/K) is the convenient size for solids: 1 ppm/K = 10⁻⁶ K⁻¹ = 1 µm per metre per kelvin. Steel is about 12, aluminium 23 and fused silica about 0.5 ppm/K.
Symbol: ppm/K
Quantity: coefficient of thermal expansion (α, CTE)
SI relation: 1 ppm/K = 0.000001 K⁻¹ (exact)
Derivation: 1 ppm/K = 10⁻⁶ K⁻¹ = 1 µm/(m·K) = 1 µm/(m·°C)
Exact: yes, by definition
Typical uses
- Material datasheets for metals, ceramics and polymers
- Electronics and PCB design (CTE matching)
- Precision engineering and optics
Convert ppm per kelvin to other units
| Conversion | 1 ppm/K equals | Reverse |
|---|---|---|
| ppm per kelvin to per kelvin | 0.000001 K⁻¹ | per kelvin to ppm per kelvin |
| ppm per kelvin to per degree Celsius | 0.000001 °C⁻¹ | per degree Celsius to ppm per kelvin |
| ppm per kelvin to per degree Fahrenheit | 5.555555556 × 10⁻⁷ °F⁻¹ | per degree Fahrenheit to ppm per kelvin |
| ppm per kelvin to ppm per degree Fahrenheit | 0.5555555556 ppm/°F | ppm per degree Fahrenheit to ppm per kelvin |
Open the Thermal Expansion Coefficient Converter to convert any value between all units.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, degree Celsius.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). ppm/K. Retrieved October 25, 2026, from https://scientificconverters.com/units/ppm-per-kelvin/
IEEE
Scientific Converters, "ppm/K," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/ppm-per-kelvin/