"Gram" can refer to several things, depending on the context. Here are a few of the most common meanings: 1. **Unit of Mass**: A gram is a metric unit of mass equal to one thousandth of a kilogram (0.001 kg). It is commonly used to measure small weights in fields such as cooking, nutrition, and science.
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The kilogram is the SI base unit; prefixes for decimal multiples and submultiples of mass are attached to gram. This special convention gives milligram and microgram, rather than stacked prefixes on kilogram. Mass remains distinct from weight, a force.[ref]
The International System of Units (SI), ninth edition, SI Brochure. §3, prefixes and the kilogram exception