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# How many grams are in 1 ml?

Wiki User

2012-12-31 21:50:39

1 mL = 1 gram.

The above is only approximately true and only for pure water at a specific temperature. The reference given below shows that the value is always slightly less than 1. Originally the gram was defined so that it was exactly equal to water at 4 degrees Centigrade but this changed when the gram was redefined to be equal to a standard prototype mass.

Generally speaking, the question cannot be answered sensibly. A millilitre is a measure of volume, with dimensions [L3]. A gram is a measure of mass, with dimensions [M]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information, such as the assumption that the mass in question is pure water at a specific temperature.

As a simple mental exercise consider a millilitre of air and a millilitre of water. They will have very different masses.

Wiki User

2012-12-31 21:50:39
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