Convert ppm per kelvin to Millimetres per metre per degree Fahrenheit
Convert ppm per kelvin (ppm/K) to Millimetres per metre per degree Fahrenheit (mm/(m·°F)) instantly and accurately.
Conversion Formula
mm/(m·°F) = ppm/K × 0.0005555555556
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 Millimetres per metre per degree Fahrenheit
The mm/(m·°F) equals 9/5 × 10⁻³ /K ≈1.8 × 10⁻³ /K, combining metric displacement with Fahrenheit temperature. It appears in US-origin pipeline and structural reports where dimensions are given in metres but temperatures in °F. Steel: ≈0.00667 mm/(m·°F); aluminium: ≈0.01283 mm/(m·°F). 1 mm/(m·°F) = 9/5 × 10⁻³ /K.
Quick Reference Table
| ppm per kelvin (ppm/K) | Millimetres per metre per degree Fahrenheit (mm/(m·°F)) |
|---|---|
| 1 ppm/K | 0.000555556 mm/(m·°F) |
| 2 ppm/K | 0.00111111 mm/(m·°F) |
| 5 ppm/K | 0.00277778 mm/(m·°F) |
| 10 ppm/K | 0.00555556 mm/(m·°F) |
| 25 ppm/K | 0.0138889 mm/(m·°F) |
| 50 ppm/K | 0.0277778 mm/(m·°F) |
| 100 ppm/K | 0.0555556 mm/(m·°F) |