Units of Measure

How many mcg equal 100 milliliters?

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June 28, 2017 11:53AM

None, since there can be no conversion.

A microgram is a measure of mass. A millilitre is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.


Consider a millilitre of air. How many micrograms? Next consider the same volume of water. How many micrograms?


The masses of equal volumes of the two substances will clearly be very different. So there is no direct conversion between mass and volume: you need to know the density of the substance to enable you to carry out the conversion.

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June 24, 2017 10:44PM

One is a measure of mass, the other is a unit of volume, so you can't have a standard conversion. For a specific substance, you would need to know the density of the substance, and then use the relationship:mass = volume x density