The standard International System of Units (SI) unit of mass is the kilogram (kg).
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The standard unit to measure mass is kilograms.
The ounce is a unit of mass but it can also be used as a unit of volume. It is not a standard international unit. A standard unit of mass is kilogram and unit for volume is cubic metres. 1000 L = 1 m3
The fundamental unit is the gram. However the standard unit (SI) used is the kilogram (1000 grams).AnswerThe terms 'fundamental unit' or 'standard unit' are not used in SI. The correct term is 'base unit', and the base unit for mass is the kilogram.
Usually to measure mass, one uses grams or kilograms.
In the SI - the current metric system - that would be the kilogram. In older metric systems, the gram has been used as the unit of mass.