In a vapour absorption system, if F is the mass flow rate of the rich solution and D is the mass flow rate of vapour distilled, then specific rich solution circulation 'f' is given by ratio \(F \over D \).

The specific weak solution circulation is expressed by 

1
\(1 \over f \)
2
(f - 1)
3
\(f \over (f-1) \)
4
\((f-1) \over f \)

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