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定义
公制质量单位，等于千克的千分之一（10⁻³ kg），最初定义为4°C时1立方厘米水的质量。
解释
The gram provides a convenient scale for everyday small masses: a paperclip weighs about 1 gram; a US nickel coin weighs exactly 5 grams; a slice of bread weighs roughly 25–30 grams. Nutrition labels express nutrient content in grams and milligrams. The milligram (mg = 0.001 g) is used in pharmacology for drug dosages; the microgram (µg = 10⁻⁶ g) is used for vitamins and trace minerals.
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