Axis

pH

pHpH

The hydrogen-ion activity scale: pH = −log₁₀[H⁺].

Dimension
N/L⁻³
Canonical signature
L^-3*N
System
common
Exactness
Exact by definition

Definition record

How this unit is defined

Canonical base
1 pH = 100 mol/m³
Conversion type
log
Historical notes
Strictly an activity; treated as concentration in dilute solution.
Aliases
pH scale, hydrogen ion concentration

Same dimension

Related units

mole per litresi acceptedmol/Lmillimole per litresi acceptedmmol/Lmolarsi acceptedMmole per cubic metresimol/m³micromole per litresi acceptedµmol/Lmillimolarsi acceptedmMequivalent per litresi acceptedeq/Lmilliequivalent per litresi acceptedmEq/L

Common conversions

Every conversion routes through the canonical base of the dimension.

1 pH = 100 mol/m³

Exact by definition relationship

10 pH = 0.0000001 mol/m³

Exact by definition relationship