What is the equivalent of one gram in milligrams?

One gram is equivalent to 1000 milligrams, which is the reason why this is the correct choice. The metric system operates on a base-10 system, making conversions between different units straightforward. In this case, the prefix "milli-" means one-thousandth of a unit. Thus, when converting grams to milligrams, you multiply the number of grams by 1000. Therefore, since there is 1000 milligrams per gram, one gram equals 1000 milligrams. This fundamental understanding of metric conversions is essential in various scientific fields, including the Navy Nuclear program, where precise measurements are crucial.