part per million per kelvin
Thermal expansion coefficientexact by definition
The part per million per kelvin is 10⁻⁶ /K and is how nearly every materials datasheet states thermal expansion, because the raw SI number is inconveniently small. Aluminium is 23 ppm/K, steel 12, borosilicate glass 3.3, and Invar 1.2.
Watch out: A ppm/K figure is almost always the LINEAR coefficient. Volumetric expansion is three times it for an isotropic solid, and mixing the two is a factor-of-three error that hides well in a spreadsheet.
| 1 | 0.000001 |
One part per million per kelvin in every thermal expansion coefficient unit
| 1 | part per million per kelvin (ppm/K)this unit | |
| 1 | part per million per Celsius degree (ppm/°C) | |
| 0.555556 | part per million per Fahrenheit degree (ppm/°F) | |
| 0.555556 | microinch per inch per Fahrenheit degree (μin/(in·°F)) | |
| 0.0001 | percent per Celsius degree (%/°C) | |
| 0.0000555556 | percent per Fahrenheit degree (%/°F) | |
| 0.000001 | per kelvin (1/K) | |
| 0.000001 | per Celsius degree (1/°C) | |
| 5.55556e-07 | per Fahrenheit degree (1/°F) | |
| 5.55556e-07 | per Rankine degree (1/°R) |
Solvers that use thermal expansion coefficient