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Within a set positive numbers, a number is small if it is close to zero. A number is smaller if it is less than another number. Within a set of positive and negative numbers there is ambiguity, because being closer to zero does not correspond to being less, but to being less in absolute value. Depending on context a negative number may be called "smaller" if it is closer to zero, or if it is more negative. This article deals with positive numbers, and is also applicable to negative numbers by taking the absolute value. Small numbers are numbers that are small compared with the numbers used in everyday life. Very small numbers often occur in fields such as chemistry, electronics and quantum physics. == Fractions == As soon as systems of weights and measures were devised, units were subdivided into smaller units: pounds were divided into ounces, pounds into shillings and pence. Beyond the smallest units, there was a need to use vulgar fractions to represent even smaller quantities. In systems such as the degrees-minutes-seconds system, it is possible to represent one second of arc, equal to : of a circle. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Small number」の詳細全文を読む スポンサード リンク
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