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Concentration

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Antreas:
What is the default unit of concentration of commercial reagents when only "%" is stated and no "w/w", "w/v" or "v/v"?

H2SO4 98% (w/w or w/v?)
H2O2 30% (w/w or w/v?)

Thanks!

AWK:
For solids and liquids "w/w" is a default. Solutions of some biochemical (biomedical) reagents may be given in "w/v". Solutions of ethanol only may be given in "v/v" or proofs (but should be stated).

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