when given a specific gravity number with a sample number how do i find the mass?

when given a specific gravity number with a sample number how do i find the mass?

ex. a 30mL urine sample has specific gravity of 1.028

ex2. the specific gravity of olive oil is .703. how many grams of olive oil will fit into a bottle that holds 16.9 fl oz

if you can please explain specific gravity in depth that would be great help

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