単位記号の規則
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定義
BIPMが定めるSI単位記号の書き方の規則：立体（ローマン体）、大文字小文字の区別あり、複数形なし、末尾のピリオドなし、数値との間にスペースを入れる。
解説
Correct: 5 kg, 273.15 K, 100 MHz, 9.81 m/s². Incorrect: 5 Kg (K is kelvin, not kilo), 100 mhz (MHz must be capitalized), 5kgs (no plural, no space), 5 m. (no period). The prefix and unit form a single symbol without a space: km, not k m. These rules prevent ambiguity: ‘ms’ means milliseconds, while ‘mS’ means millisiemens.
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