PCO2
PARTIAL PRESSURE OF CARBON DIOXIDE OFTEN USED IN REFERENCE TO BLOOD
PaCO2; Partial pressure of carbon dioxide
pCO2, pCO2, or P_\ce{CO2}is the partial pressure of carbon dioxide (CO2), often used in reference to blood but also used in meteorology, climate science, oceanography, and limnology to describe the fractional pressure of CO2 as a function of its concentration in gas or dissolved phases. The units of pCO2 are mmHg, atm, torr, Pa, or any other standard unit of atmospheric pressure.