Thermal Expansion Coefficient Converter
Thermal Expansion Coefficient Converter: convert between 5 thermal expansion coefficient units, for example 1 ppm/K = 0.5555555556 ppm/°F.
| Unit | Value |
|---|---|
| ppm per kelvin to per kelvin | 0.000001 K⁻¹ |
| ppm per kelvin to per degree Celsius | 0.000001 °C⁻¹ |
| ppm per kelvin to per degree Fahrenheit | 5.555555556 × 10⁻⁷ °F⁻¹ |
| ppm per kelvin (ppm/K) | 1 ppm/K |
| ppm per kelvin to ppm per degree Fahrenheit | 0.5555555556 ppm/°F |
Convert coefficients of thermal expansion between 1/K, 1/°C, 1/°F, ppm/K (µm/m·K) and ppm/°F (µin/in·°F). Only the size of the degree matters: 1/°C = 1/K, and 1/°F = 1.8/K exactly.
Why no offset?
α is a change in length per degree of temperature change, so it converts with the interval ratio only (1 °F of change = 5/9 K). The 32 °F and 273.15 K offsets of temperature readings do not apply.
Thermal Expansion Coefficient unit definitions
- per kelvin (K⁻¹)
- The reciprocal kelvin (K⁻¹, 1/K) is the SI unit of the coefficient of thermal expansion α: the fractional change in length for each kelvin of temperature change. Carbon steel is about 12 × 10⁻⁶ K⁻¹.
- ppm per kelvin (ppm/K)
- Parts per million per kelvin (ppm/K) is the convenient size for solids: 1 ppm/K = 10⁻⁶ K⁻¹ = 1 µm per metre per kelvin. Steel is about 12, aluminium 23 and fused silica about 0.5 ppm/K.
- per degree Celsius (°C⁻¹)
- Per degree Celsius (1/°C) is numerically identical to per kelvin, because Celsius and kelvin degrees are the same size. Engineering handbooks often quote α in 1/°C.
- per degree Fahrenheit (°F⁻¹)
- Per degree Fahrenheit (1/°F, also written in/in/°F) is the US customary unit of the expansion coefficient. Because a Fahrenheit degree is smaller, the number is 1/1.8 of the per-kelvin value: steel is about 6.5 × 10⁻⁶ /°F.
- ppm per degree Fahrenheit (ppm/°F)
- Parts per million per degree Fahrenheit is the same as microinches per inch per °F (µin/in·°F), the form used in US datasheets. Divide a ppm/K value by 1.8 to get ppm/°F.
Popular thermal expansion coefficient conversions
- per kelvin to per degree Fahrenheit
- per degree Fahrenheit to per kelvin
- ppm per kelvin to ppm per degree Fahrenheit
- ppm per degree Fahrenheit to ppm per kelvin
Show all 20 thermal expansion coefficient conversions
From per kelvin
From per degree Celsius
From per degree Fahrenheit
From ppm per kelvin
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- °C to °F (temperatures)
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Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology.
Last reviewed: .