If it is a question relating to chemistry, perhaps it
assumes ready availability of some chemicals or facilities of testing. Bur if it is a
question from common everyday life, I will try to make out the substance from its smell.
While water will have no smell, vinegar will have a very distinct smell. Acid will have
some kind of acrid smell which I may not recognize very clearly. If some how or the
other I had a means of knowing that is is only one of these three options the smell test
will be good enough to identify the liquid clearly. But If I do not have these three
possible options, things will be more difficult.
But then I
will not just stop with the smell test. I will also try to find the source from which
the liquid in the puddle has come. Once possible sources have been identified, I will
match the smell of liquid in puddle with that in suspected source. If this matches, it
will be a confirmation of the original smell test.
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