Part per million per degree Fahrenheit (ppm/°F)

One millionth per degree Fahrenheit, the same as one microinch per inch per degree Fahrenheit.

What is a part per million per degree Fahrenheit?

Symbol: ppm/°F
Quantity: Thermal Expansion
Unit system: US customary
Definition: One millionth per degree Fahrenheit, the same as one microinch per inch per degree Fahrenheit.
Exact: Yes, the value is exact by definition
Source: NIST Special Publication 811 (2008), Appendix B.8

Used in US material data and piping design, often written as µin/(in·°F).

Part per million per degree Fahrenheit in other units
Part per million per degree Fahrenheit	Part per million per kelvin	Per kelvin	Per degree Celsius
1 ppm/°F	= 1.8 ppm/K	= 0.0000018 1/K	= 0.0000018 1/°C
10 ppm/°F	= 18 ppm/K	= 0.000018 1/K	= 0.000018 1/°C
100 ppm/°F	= 180 ppm/K	= 0.00018 1/K	= 0.00018 1/°C
1000 ppm/°F	= 1800 ppm/K	= 0.0018 1/K	= 0.0018 1/°C

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

The next larger thermal expansion unit is the reciprocal kelvin (1/K). 1 ppm/°F = 0.0000018 1/K, and 1 1/K ≈ 555555.5556 ppm/°F.

How many parts per million per kelvin are in one part per million per degree Fahrenheit?: One part per million per degree Fahrenheit = 1.8 ppm/K (parts per million per kelvin).
How many reciprocal kelvins are in one part per million per degree Fahrenheit?: One part per million per degree Fahrenheit = 0.0000018 1/K (reciprocal kelvins).
How many reciprocal degrees Celsius are in one part per million per degree Fahrenheit?: One part per million per degree Fahrenheit = 0.0000018 1/°C (reciprocal degrees Celsius).