Axis

Mole, mass & volume fractions

parts per millionppm

One part per million (10⁻⁶).

Dimension
1
Canonical signature
1
System
common
Exactness
Exact

Definition record

How this unit is defined

Canonical base
This unit defines its own base.
Conversion type
linear
Historical notes
Mole, mass, and volume bases are identical only in the dilute ideal limit; label the basis.
Aliases
parts per million, ppmv, ppmw

Same dimension

Related units

percentcommon%decibelsi accepteddBMach numbercommonMaparts per billioncommonppbspecific gravitycommonSGparts per trillioncommonpptexposure valuecommonEVper millecommon‰

Common conversions

Every conversion routes through the canonical base of the dimension.

This unit defines its own dimension.