absolute pressure unit in Fluent?
 

the the diffusion coefficient using kinetic theory is give out by equation(7.7-16)in Fluent User's Guide 7.7.4 Mass Diffusion Coefficient Inputs,I would like to know is the absolute pressure unit in the equation 7.7-16,is it atm or pascal?coz I see from one paper it is atm,unfortunately I could not find another one mention about that. anyone knows,thanks.