"Mg" is a metric unit. It's 0.001 gram.
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Mg is the symbol for milligram, which is a unit of mass in the metric system. One milligram is equal to one thousandth of a gram.
The common metric units used to report density are grams per cubic centimeter (g/cm^3) or kilograms per cubic meter (kg/m^3).
For the metric (SI) system it is kilograms(kg), or grams(g), usually. Milligrams (mg) is pretty common as well. Also there is the metric ton (sometimes called tonne) which is equal to 1000 kg or 1 Mg (Megagram). Note the difference between mg and Mg! In the imperial or customary system, there are grains, ounces (several kinds), pounds, tons.
1 mg is equal to 0.001 g. To convert milligrams to grams, divide the number of milligrams by 1000.
The metric unit of mass is the gram (g) in the International System of Units (SI). Other common metric units of mass include the kilogram (kg) and the metric tonne (t).
No, not all metric units are part of the International System of Units (SI). The SI is a coherent system of units derived from the metric system, but it is more specific and defined, and not all metric units are included in the SI.