Convert ppm per degree Fahrenheit to Per millikelvin
Convert ppm per degree Fahrenheit (ppm/°F) to Per millikelvin (1/mK) instantly and accurately.
Conversion Formula
1/mK = ppm/°F × 1.800000000e-9
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 millikelvin
The per millikelvin (1/mK) equals exactly 10³ /K and is encountered in cryogenic physics where working temperatures lie in the millikelvin range. Near quantum phase transitions and magnetic ordering temperatures, anomalous CTE values can reach orders far above room-temperature CTE. 1 /mK = 10³ /K = 10⁹ ppm/K.
Quick Reference Table
| ppm per degree Fahrenheit (ppm/°F) | Per millikelvin (1/mK) |
|---|---|
| 1 ppm/°F | 1.8 × 10-9 1/mK |
| 2 ppm/°F | 3.6 × 10-9 1/mK |
| 5 ppm/°F | 9 × 10-9 1/mK |
| 10 ppm/°F | 1.8 × 10-8 1/mK |
| 25 ppm/°F | 4.5 × 10-8 1/mK |
| 50 ppm/°F | 9 × 10-8 1/mK |
| 100 ppm/°F | 1.8 × 10-7 1/mK |