Convert Per degree Fahrenheit to ppm per kelvin
Convert Per degree Fahrenheit (1/°F) to ppm per kelvin (ppm/K) instantly and accurately.
Conversion Formula
ppm/K = 1/°F × 1800000
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).
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
| Per degree Fahrenheit (1/°F) | ppm per kelvin (ppm/K) |
|---|---|
| 1 1/°F | 1800000 ppm/K |
| 2 1/°F | 3600000 ppm/K |
| 5 1/°F | 9000000 ppm/K |
| 10 1/°F | 18000000 ppm/K |
| 25 1/°F | 45000000 ppm/K |
| 50 1/°F | 90000000 ppm/K |
| 100 1/°F | 180000000 ppm/K |