Axis

Mole, mass & volume fractions

parts per trillionppt

One part per trillion (10⁻¹²).

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
Confusable with precipitation-timing contexts; here a pure fraction.
Aliases
parts per trillion, pptv

Same dimension

Related units

percentcommon%decibelsi accepteddBparts per millioncommonppmMach numbercommonMaparts per billioncommonppbspecific gravitycommonSGexposure valuecommonEVper millecommon‰

Common conversions

Every conversion routes through the canonical base of the dimension.

This unit defines its own dimension.