Discussion
Consider the following statements about labelling a flow diagram.
1. Every stream should carry a symbol for its flow and its composition.
2. Known values should be written on the diagram rather than kept aside.
3. Unknowns should be minimised by using the same symbol for different streams.
Answer: B
The first two are correct and are basic discipline. The third invites exactly the confusion the labelling is meant to prevent, since two streams that happen to be equal must still be shown to be so. An equality is a result of the balance, not an assumption.
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