Ph

• express by a whole number or a whole number followed by a decimal point and one or two digits. A whole number may be followed by a decimal point and a 0 to demonstrate that the value following the decimal point has not been mistakenly deleted.

E.g. pH 7.55 pH 7.4 pH 7.0

• do not express other than with a lowercase p and capital H. if the term begins a sentence, precede it by The or recast the sentence.

E.g. D: pH was 6.47
T: The pH was 6.47