The full meaning of pH is the potential of hydrogen or power of hydrogen. It is a quantitative measure of the acidity or basicity of an aqueous solution. Mathematically, pH is defined as the negative base-10 logarithm of the hydrogen ion concentration ($$\text{H}^+$$), expressed in moles per liter ($$\text{mol/L}$$): $$ \text{pH} = -\log_{10}[\text{H}^+] $$ This logarithmic scale allows for a wide range of hydrogen ion concentrations to be expressed in a compact way.