Convert ppm per kelvin to Microinches per inch per degree Fahrenheit

Convert ppm per kelvin (ppm/K) to Microinches per inch per degree Fahrenheit (μin/(in·°F)) instantly and accurately.

ppm per kelvin (ppm/K)
Microinches per inch per degree Fahrenheit (μin/(in·°F))

Conversion Formula

μin/(in·°F) = ppm/K × 0.5555555556

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 Microinches per inch per degree Fahrenheit

The microinch per inch per degree Fahrenheit (μin/(in·°F)) equals exactly 9/5 × 10⁻⁶ /K = 1 ppm/°F. It is the native US CTE unit in ASTM E228 and ASTM E831 standards; most US material datasheets list CTE values in this unit. Steel: ≈6.7 μin/(in·°F); aluminium: ≈12.8 μin/(in·°F); titanium: ≈4.9 μin/(in·°F). 1 μin/(in·°F) = 1 ppm/°F.

Quick Reference Table

ppm per kelvin (ppm/K)Microinches per inch per degree Fahrenheit (μin/(in·°F))
1 ppm/K0.555556 μin/(in·°F)
2 ppm/K1.11111 μin/(in·°F)
5 ppm/K2.77778 μin/(in·°F)
10 ppm/K5.55556 μin/(in·°F)
25 ppm/K13.8889 μin/(in·°F)
50 ppm/K27.7778 μin/(in·°F)
100 ppm/K55.5556 μin/(in·°F)

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