# PO2 and PCO2

Discussion in 'Feedback and Suggestions' started by Jim Hunter, Jan 27, 2013.

1. ### Jim Hunter Thread Starter New Member

Jan 27, 2013
9
4

"Incidentally, the "p" prefix is also used with other types of chemical measurements where a logarithmic scale is desired, pCO2 (Carbon Dioxide) and pO2 (Oxygen) being two such examples."

$P_{O_{2}}$ and $P_{CO_{2}}$ refer to partial pressure of oxygen and carbon dioxide, respectively, and are not logarithmic.

2. ### Wendy Moderator

Mar 24, 2008
20,993
2,731
So how would you correct it?

I generally show a before and after statement.

3. ### Jim Hunter Thread Starter New Member

Jan 27, 2013
9
4
I would delete that sentence. It doesn't really add anything, and the only other example of that notation that I can think of right now is the dissociation constant of a weak acid ($pK_a$), which also wouldn't add to the reader's understanding of the concept of pH.