how to convert ppm to mol/m^2

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jy g

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Jun 27, 2023, 9:06:27 AM6/27/23
to wrf-chem-fire_emiss
  The result of running out is ppmv, how do you convert ppmv to molecule/m^2? I see a formula, t=273/t;
p=P/101325;
Vm=22.4/(t.*p);
for n = 1:(nlayer)
ready_nh3(:,:,n,:)=60.2.*heigth(:,:,n,:).*nh3(:,:,n,:)./Vm;
end, may I ask where the 60.2 in this one comes from  
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