Convert ppm per kelvin to Per degree Fahrenheit
Convert ppm per kelvin (ppm/K) to Per degree Fahrenheit (1/°F) instantly and accurately.
Conversion Formula
1/°F = ppm/K × 5.555555556e-7
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 Per degree Fahrenheit
The per degree Fahrenheit (1/°F = °F⁻¹) equals exactly 9/5 /K = 1.8 /K and is the imperial counterpart of the SI unit. Found in ASME boiler and pressure vessel codes, ASHRAE engineering tables, and UL material data sheets. Iron: ≈6.7 × 10⁻⁶ /°F; ordinary glass: ≈4.9 × 10⁻⁶ /°F. 1 /°F = 9/5 /K (= 1/°R).
Quick Reference Table
| ppm per kelvin (ppm/K) | Per degree Fahrenheit (1/°F) |
|---|---|
| 1 ppm/K | 5.556 × 10-7 1/°F |
| 2 ppm/K | 1.111 × 10-6 1/°F |
| 5 ppm/K | 2.778 × 10-6 1/°F |
| 10 ppm/K | 5.556 × 10-6 1/°F |
| 25 ppm/K | 1.389 × 10-5 1/°F |
| 50 ppm/K | 2.778 × 10-5 1/°F |
| 100 ppm/K | 5.556 × 10-5 1/°F |