How many ml in 120 grams?

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There is no sensible answer to this question. A millilitre is a

measure of volume, with dimensions [L3]. A gram is a measure of

mass, with dimensions [M]. Basic dimensional analysis teaches that

you cannot convert between measures with different dimensions

without additional information. A little thought will make it clear

that 1 gram of air will occupy far more volume than 1 gram of lead,

for example.