Attometre (American spelling: attometer, symbol: am) is an SI measure of length that is equal to 10⁻¹⁸, or 1 quintillionth (atto-) of a metre. An electron's radius is thought to be about 1 am. American English or U.S. English is the diverse form of the English language used mostly in the United States of America. ... SI (disambiguation). ... Atto- (symbol a) is an SI prefix to a unit and means that it is 10-18 times this unit. ... metre or meter, see meter (disambiguation) The metre is the basic unit of length in the International System of Units. ... Properties The electron (sometimes called negatron; commonly represented as e−) is a subatomic particle. ...

• 1 am = 1 × 10⁻¹⁸ metre

zeptometre << attometre << femtometre metre or meter, see meter (disambiguation) The metre is the basic unit of length in the International System of Units. ... Zeptometre (American spelling: zeptometer) is an SI measure of length that is equal to 10-21 (zepto-) of a metre. ... Femtometre (American spelling: femtometer) is an SI measure of length that is equal to 10−15 (femto) of a metre. ...

See also

• 1 E-18 m
• SI
• SI prefix
• Orders of magnitude