オーダー（桁）
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定義
10のべき乗を用いて数量を表現・比較する方法で、各オーダーは前のオーダーの10倍の差を表す。
解説
The difference between 1 mm and 1 km is 6 orders of magnitude (10⁶). The observable universe spans roughly 93 billion light-years, while a proton is about 10⁻¹⁵ m — a difference of 41 orders of magnitude. Orders of magnitude are indispensable when comparing quantities too different for ordinary arithmetic.
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