1/∘R\text{1/}^{\circ}\text{R}

per Rankine degree

Thermal expansion coefficientexact by definition

The per Rankine degree is exactly 9/5 per kelvin, the same size as per Fahrenheit degree. It is used where the surrounding calculation carries absolute temperature, as in the ideal-gas expansion coefficient 1/T, which is 1/519.67 °R⁻¹ at 60 °F.

1 1/∘R\text{1/}^{\circ}\text{R} 1.8 1/K\text{1/K}

One per rankine degree in every thermal expansion coefficient unit

1,800,000part per million per kelvin (ppm/K)
1,800,000part per million per Celsius degree (ppm/°C)
1,000,000part per million per Fahrenheit degree (ppm/°F)
1,000,000microinch per inch per Fahrenheit degree (μin/(in·°F))
180percent per Celsius degree (%/°C)
100percent per Fahrenheit degree (%/°F)
1.8per kelvin (1/K)
1.8per Celsius degree (1/°C)
1per Fahrenheit degree (1/°F)
1per Rankine degree (1/°R)this unit