Convert ppm per degree Fahrenheit to Per kelvin
Convert ppm per degree Fahrenheit (ppm/°F) to Per kelvin (1/K) instantly and accurately.
Conversion Formula
1/K = ppm/°F × 1.800000000e-6
About ppm per degree Fahrenheit
The ppm/°F (= μin/(in·°F) exactly) equals 9/5 × 10⁻⁶ /K ≈1.8 × 10⁻⁶ /K and is the dominant CTE unit in US ASTM standards, ASME piping codes, and mechanical engineering handbooks. Steel ≈6.7 ppm/°F; aluminium ≈12.8 ppm/°F; copper ≈9.4 ppm/°F. 1 ppm/°F = 9/5 × 10⁻⁶ /K.
About Per kelvin
The per kelvin (1/K = K⁻¹) is the SI unit for linear thermal expansion coefficient (α = (1/L) dL/dT). Used in NIST databases, FEA material cards, and thermodynamics textbooks. Liquid mercury: ≈6.1 × 10⁻⁵ /K; aluminium: ≈2.3 × 10⁻⁵ /K; fused silica: ≈5.5 × 10⁻⁷ /K. 1 /K = 10⁶ ppm/K = 1/°C.
Quick Reference Table
| ppm per degree Fahrenheit (ppm/°F) | Per kelvin (1/K) |
|---|---|
| 1 ppm/°F | 1.8 × 10-6 1/K |
| 2 ppm/°F | 3.6 × 10-6 1/K |
| 5 ppm/°F | 9 × 10-6 1/K |
| 10 ppm/°F | 1.8 × 10-5 1/K |
| 25 ppm/°F | 4.5 × 10-5 1/K |
| 50 ppm/°F | 9 × 10-5 1/K |
| 100 ppm/°F | 0.00018 1/K |