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定義
正確に2.54 cmまたはフィートの1/12と定義されるヤード・ポンド法の長さの単位。
解説
The inch was historically defined as three barleycorns placed end to end. Since 1959, it has been fixed at exactly 2.54 cm by international agreement. Screen sizes (phones, TVs, monitors) are universally measured in diagonal inches: a 15-inch laptop screen measures 38.1 cm diagonally. Tire width and pipe diameter are also typically expressed in inches.
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