翻訳と辞書 |
Millimetre
The millimetre (International spelling as used by the International Bureau of Weights and Measures) or millimeter (American spelling) (SI unit symbol mm) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length. It is equal to 1,000 micrometres and 1,000,000 nanometres. There are 25.4 mm in one inch by definition, so a millimetre is exactly equal to inch. ==Definition== Since 1983, the metre has been defined as "the length of the path travelled by light in vacuum during a time interval of of a second."〔(【引用サイトリンク】title=17th General Conference on Weights and Measures (1983), Resolution 1. )〕 A millimetre, of a metre, is therefore the distance travelled by light in of a second.
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「Millimetre」の詳細全文を読む
スポンサード リンク
翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|