ph เจลทำความสะอาดมือ
pH - Wikipedia- ph เจลทำความสะอาดมือ ,In chemistry, pH (/ p iː ˈ eɪ tʃ /, denoting 'potential of hydrogen' or 'power of hydrogen') is a scale used to specify the acidity or basicity of an aqueous solution.Acidic solutions (solutions with higher concentrations of H + ions) are measured to have lower pH values than basic or alkaline solutions..