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The yoctometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: ym) or yoctometer (American spelling) is an SI measure of length that is equal to (yocto) of a metre. A yoctometre is equivalent to 1/100,000 the diameter of a proton or neutron. : * 1 ym = 1 metre In terms of relative length of units, a yoctometre ranks as follows: Planck length << yoctometre << zeptometre. A yoctometre is 1/1000 of a zeptometre (1 zeptometre (zm) = 1,000 yoctometres). The yoctometre,is the distance light travels in about:1÷2.99×1035 seconds. ==Measurement Equivalents== There are some objects in the universe that can easily define yoctometre.They are considered as the smallest objects in the universe. 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「yoctometre」の詳細全文を読む スポンサード リンク
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