The hydrogen concentration [ $\displaystyle{H}+\usepackage{cmbright}\Huge\$ ] of vinegar is about $\displaystyle{1}\times{{10}}^{{-{{3}}}}\usepackage{cmbright}\Huge\$ . Use the formula $\displaystyle{p}{H}=-{\log{{\left[{H}+\right]}}}\usepackage{cmbright}\Huge\$ to find the approximate pH level of vinegar.

$\displaystyle{p}{H}=\usepackage{cmbright}\Huge\$ _____