PH

pH he yùng-yi̍t chûng Khîn lì-chṳ́ fa̍t-thu ke yit-chúng phêu-thu, ya chhiu-he thûng-sòng yi-ngi song yùng-yi̍t sôn-kán chhàng-thu ke fên-liòng phêu-chún. Liá-ke khái-ngiam he 1909-ngièn yù Tan-ma̍k Sâng-vu̍t Fa-ho̍k-kâ Søren Peter Lauritz Sørensen thì-chhut.

pH ke kie-son kûng-sṳt:

$\text{pH}=-{\log }_{10}\left[{\text{H}}^{+}\right]={\log }_{10}\frac{1}{\left[{\text{H}}^{+}\right]}$

Nernst kûng-sṳt:

$E=E^0+\frac{RT}{nF}\ln (a_{{\text{H}}^{+}});\mathrm{p}\mathrm{H}=\frac{E^0-E}{2.303RT/F}$