ml is unit of Volume and g is unit of mass(consider weight for all general purpose here on earth).
Volume is about how much space any matter takes i.e. occupies.
Now when you add sugar(high density matter) into water, it will add to the same weight as addition of sugar and water weight but it will not be of same volume.
100g of water = 100ml of water because density of water is 1g/ml(1g/cc)
100g of sugar not equal to 100ml of sugar consider sugar density of 1.59g/cc
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