ppm/∘C\text{ppm/}^{\circ}\text{C}

part per million per Celsius degree

Thermal expansion coefficientexact by definition

The part per million per Celsius degree is exactly equal to ppm/K, since expansion is per degree of temperature change. Both labels appear on datasheets and they mean the same thing.

1 ppm/∘C\text{ppm/}^{\circ}\text{C} 0.000001 1/K\text{1/K}

One part per million per celsius degree in every thermal expansion coefficient unit

1part per million per kelvin (ppm/K)
1part per million per Celsius degree (ppm/°C)this unit
0.555556part per million per Fahrenheit degree (ppm/°F)
0.555556microinch per inch per Fahrenheit degree (μin/(in·°F))
0.0001percent per Celsius degree (%/°C)
0.0000555556percent per Fahrenheit degree (%/°F)
0.000001per kelvin (1/K)
0.000001per Celsius degree (1/°C)
5.55556e-07per Fahrenheit degree (1/°F)
5.55556e-07per Rankine degree (1/°R)