The conversion from milliliters (ml) to grams (g) depends on the density of the substance in question. The density of a substance represents how much mass is present in a unit volume.
For example, the density of water is approximately 1 gram per milliliter (1 g/ml), which means that 120 milliliters of water would weigh approximately 120 grams.
However, for other substances, the density may be different, and the conversion factor would change accordingly.
Therefore, to convert 120 ml to grams, you need to know the density of the substance you are measuring.