Part per million per kelvin (ppm/K)

One millionth per kelvin, the same as one micrometer per meter per kelvin. Most metals expand by 10 to 25 ppm/K.

What is a part per million per kelvin?

Symbol: ppm/K
Quantity: Thermal Expansion
Unit system: SI
Definition: One millionth per kelvin, the same as one micrometer per meter per kelvin. Most metals expand by 10 to 25 ppm/K.
Exact: Yes, the value is exact by definition
Source: SI Brochure, 9th edition (BIPM, 2019)

Common applications

The usual way to state expansion coefficients on material data sheets, for metals, ceramics, glass and electronic substrates.

Part per million per kelvin in other thermal expansion units

1 ppm/K = 0.000001 1/KPer kelvin
1 ppm/K = 0.000001 1/°CPer degree Celsius
1 ppm/K ≈ 5.555555556e-7 1/°FPer degree Fahrenheit
1 ppm/K ≈ 0.5555555556 ppm/°FPart per million per kelvin to Part per million per degree Fahrenheit converter

Part per million per kelvin quick reference

Part per million per kelvin in other units
Part per million per kelvin	Part per million per degree Fahrenheit	Per kelvin	Per degree Celsius
1 ppm/K	≈ 0.5555555556 ppm/°F	= 0.000001 1/K	= 0.000001 1/°C
10 ppm/K	≈ 5.555555556 ppm/°F	= 0.00001 1/K	= 0.00001 1/°C
100 ppm/K	≈ 55.55555556 ppm/°F	= 0.0001 1/K	= 0.0001 1/°C
1000 ppm/K	≈ 555.5555556 ppm/°F	= 0.001 1/K	= 0.001 1/°C

Where the part per million per kelvin fits

The next larger thermal expansion unit is the part per million per degree Fahrenheit (ppm/°F). 1 ppm/K ≈ 0.5555555556 ppm/°F, and 1 ppm/°F = 1.8 ppm/K.

Frequently asked questions

How many parts per million per degree Fahrenheit are in one part per million per kelvin?: One part per million per kelvin ≈ 0.5555555556 ppm/°F (parts per million per degree Fahrenheit).
How many reciprocal kelvins are in one part per million per kelvin?: One part per million per kelvin = 0.000001 1/K (reciprocal kelvins).
How many reciprocal degrees Celsius are in one part per million per kelvin?: One part per million per kelvin = 0.000001 1/°C (reciprocal degrees Celsius).