In %v/v:
As a liquid is being added to a fixed volume of another liquid, BOTH contribute to the final volume
In %w/w:
As a solid is being added to a fixed weight of a liquid/semi-solid/solid, BOTH contribute to the final weight of mixture
There are THREE different ways to express percentage strength:
The number of grams of active in 100 millilitres of mixture
Used when a solid is being added to a liquid
The number of millilitres of active in 100 millilitres of mixture
Used when a liquid is being added to a liquid
The number of grams of active in 100 grams of mixture
Used when a solid is being added to a fixed weight of liquid, semi-solid, or solid
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