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It all depends upon the density of of the substance which has a volume of 0.12 fl oz; for example 0.12 fl oz of Mercury will be heavier than 0.12 fl oz of hydrogen.

A fluid ounce (fl oz) is a measure of volume

An ounce (oz) is a measure of mass:

There are related by density:

density = mass/volume

→ mass = volume × density

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7y ago

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