mil
ミル(1/1000インチ)
覚え方のコツ Memory Tip
mil はラテン語 mille「千」と結び付け、「1インチを千に分けた一つ」と捉えると覚えやすい語です。厚さを表す a few mils や a 10-mil sheet のように、製造・塗装・包装の寸法で使われます。milli- と発想は同じですが、mil 自体は1/1000インチであり、ミリメートルとは値が異なる点に注意しましょう。
Connect mil with Latin mille, meaning “thousand”: one mil is one of the thousand equal parts of an inch. It commonly appears in measurements of material thickness, as in a 10-mil plastic sheet or a coating several mils thick. The idea resembles the metric prefix milli-, because both express one thousandth, but the units must not be confused. A mil is one thousandth of an inch, not a millimeter; one mil is approximately 0.0254 millimeters.
mil の類義語・関連語
mil の語源・成り立ち Etymology
ラテン語 mille（千）に由来し、1/1000を表す単位接頭辞。mil は1/1000インチの長さの単位。同根語に millennium（千年紀）、million（百万＝千×千）がある。milli- の接頭辞も同源で、ミリメートルなど日本語にも定着している。
Mil is derived from Latin mille, meaning “thousand,” and denotes one thousandth of an inch. It is historically related in its numerical idea to the prefix milli-, as well as to words such as millennium and million. In modern technical usage, mil functions as an independent unit name, especially in manufacturing and engineering, rather than as a metric prefix.
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