Convert Percent per degree Fahrenheit to ppm per kelvin
Convert Percent per degree Fahrenheit (%/°F) to ppm per kelvin (ppm/K) instantly and accurately.
Conversion Formula
ppm/K = %/°F × 18000
About Percent per degree Fahrenheit
The %/°F equals 9/5 × 10⁻² /K ≈ 0.018 /K, the Fahrenheit percent-expansion unit used in US polymer and rubber industry specifications. PTFE: ≈0.0075 %/°F; HDPE: ≈0.0083 %/°F; silicone rubber: ≈0.056 %/°F. 1 %/°F = 9/5 × 10⁻² /K ≈1.8 %/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
| Percent per degree Fahrenheit (%/°F) | ppm per kelvin (ppm/K) |
|---|---|
| 1 %/°F | 18000 ppm/K |
| 2 %/°F | 36000 ppm/K |
| 5 %/°F | 90000 ppm/K |
| 10 %/°F | 180000 ppm/K |
| 25 %/°F | 450000 ppm/K |
| 50 %/°F | 900000 ppm/K |
| 100 %/°F | 1800000 ppm/K |