Convert ppm per kelvin to Microinches per inch per degree Fahrenheit
Convert ppm per kelvin (ppm/K) to Microinches per inch per degree Fahrenheit (μin/(in·°F)) instantly and accurately.
Conversion Formula
μin/(in·°F) = ppm/K × 0.5555555556
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 Microinches per inch per degree Fahrenheit
The microinch per inch per degree Fahrenheit (μin/(in·°F)) equals exactly 9/5 × 10⁻⁶ /K = 1 ppm/°F. It is the native US CTE unit in ASTM E228 and ASTM E831 standards; most US material datasheets list CTE values in this unit. Steel: ≈6.7 μin/(in·°F); aluminium: ≈12.8 μin/(in·°F); titanium: ≈4.9 μin/(in·°F). 1 μin/(in·°F) = 1 ppm/°F.
Quick Reference Table
| ppm per kelvin (ppm/K) | Microinches per inch per degree Fahrenheit (μin/(in·°F)) |
|---|---|
| 1 ppm/K | 0.555556 μin/(in·°F) |
| 2 ppm/K | 1.11111 μin/(in·°F) |
| 5 ppm/K | 2.77778 μin/(in·°F) |
| 10 ppm/K | 5.55556 μin/(in·°F) |
| 25 ppm/K | 13.8889 μin/(in·°F) |
| 50 ppm/K | 27.7778 μin/(in·°F) |
| 100 ppm/K | 55.5556 μin/(in·°F) |