Convert Per degree Celsius to ppm per degree Fahrenheit
Convert Per degree Celsius (1/°C) to ppm per degree Fahrenheit (ppm/°F) instantly and accurately.
Conversion Formula
ppm/°F = 1/°C × 555555.5556
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.
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.
Quick Reference Table
| Per degree Celsius (1/°C) | ppm per degree Fahrenheit (ppm/°F) |
|---|---|
| 1 1/°C | 555556 ppm/°F |
| 2 1/°C | 1111110 ppm/°F |
| 5 1/°C | 2777780 ppm/°F |
| 10 1/°C | 5555560 ppm/°F |
| 25 1/°C | 13888900 ppm/°F |
| 50 1/°C | 27777800 ppm/°F |
| 100 1/°C | 55555600 ppm/°F |