Convert ppm per degree Fahrenheit to Per degree Celsius
Convert ppm per degree Fahrenheit (ppm/°F) to Per degree Celsius (1/°C) instantly and accurately.
Conversion Formula
1/°C = 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 degree Celsius
The per degree Celsius (1/°C = °C⁻¹) equals exactly 1/K since temperature intervals 1 °C = 1 K (exact). Common in European and ISO standards, chemistry textbooks, and physics literature as an alternative notation for the SI unit 1/K. A material with α = 12 × 10⁻⁶ /K is identically expressed as 12 × 10⁻⁶ /°C. 1 /°C = 1 /K = 10⁶ ppm/K.
Quick Reference Table
| ppm per degree Fahrenheit (ppm/°F) | Per degree Celsius (1/°C) |
|---|---|
| 1 ppm/°F | 1.8 × 10-6 1/°C |
| 2 ppm/°F | 3.6 × 10-6 1/°C |
| 5 ppm/°F | 9 × 10-6 1/°C |
| 10 ppm/°F | 1.8 × 10-5 1/°C |
| 25 ppm/°F | 4.5 × 10-5 1/°C |
| 50 ppm/°F | 9 × 10-5 1/°C |
| 100 ppm/°F | 0.00018 1/°C |