The S.I. base unit for volume is the cubic meter or m^3. S.I. stands for Systeme Internationale, and includes the measurement units that are used by scientists all over the world.
The cubic meter is too large to be practical for most laboratory measurements so smaller metric units are used most of the time. Those commonly used are the liter (L), the cubic centimeter (cm^3) and the milliliter (ml). They are related as follows:
1 cubic meter = 1000 liters
1 liter = 1000 milliliters
1 milliliter = 1 cubic centimeter
A cube that is 10 cm on each side has a volume of 1 liter, which is also (10cm)^3 or 1000 cm. Since milli- is the prefix that means 1/1000, 1 cm^3 is also 1 ml So the two can be used interchangeably.
One cm^3 of water at 25ยบ or close to it has a mass of 1 gram, so in this case grams can also be used interchangeably with the volume units ml and cm^3.
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