pH
noun
- Chemistry a figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline. The pH is equal to -log10 c where c is the hydrogen ion concentration in moles per litre【化】pH值。
词源
early 20th cent.: from p representing German Potenz 'power' + H2, the symbol for hydrogen.