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from Absorption of Acetone in Air Using Water by Housam Binous
computes the number of equilibrium stages for absorption operation

f=diffAAW(x)
function f=diffAAW(x)

t=0:0.01:0.2;
y=feval(@eqAAW,t);
z=diff(y)./diff(t);

f=interp1(t(1:end-1),z,x);

end

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