Use a formula-bearing logarithmic scale
The acidity level is defined by the following formula. The raw hydrogen-ion concentration Q is measured in mol/L
\[L = -1\log_{10}\left(\frac{Q}{Q_0}\right)\]
\[Q_0 = 1\]
The quantities and levels in this item are defined only by the displayed formula
The raw hydrogen-ion concentration is
\[Q = \frac{1}{10}\]
The unit is mol/L