グラム
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定義
キログラムの1/1000（10⁻³ kg）に等しいメートル法の質量の単位。もともと4°Cの水1立方センチメートルの質量として定義された。
解説
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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