if you want to know the identity of an unknown substance, what type of formula would you most likely want to know?

Smell: Most chemists can identify solvents by their distinctive smells (though this is a pretty bad idea). ¹

Melting point: If you've got very pure crystals, you can use their melting point to figure out which of several possible chemicals you've got.

Explanation:

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in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.