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An '''attosecond''' ('''as''') is a very short period of [[time]].<ref>Website of the BIPM (Bureau International des Poids et Mesures) http://www.bipm.org/en/si/si_brochure/chapter3/prefixes.html {{WebCite|url=http://www.webcitation.org/62QUYngaK|date =2011-10-14}}</ref> It is equal to one quintillionth of a [[second]] (or 0.000000000000000001&nbsp;seconds). It can also be written as '''10^-18 seconds'''. Because it can be hard to think about how short this period of time is, on this page is a list of descriptions of periods of time longer than 1 [[attosecond]], but shorter than one [[femtosecond]] (which is 10^-15 seconds). This should help when thinking about periods of time that have different [[order of magnitude|orders of magnitude]].

An '''attosecond''' ('''as''') is a very short period of [[time]].<ref>Website of the BIPM (Bureau International des Poids et Mesures) http://www.bipm.org/en/si/si_brochure/chapter3/prefixes.html {{Webarchive|url=https://www.webcitation.org/62QUYngaK?url=http://www.bipm.org/en/si/si_brochure/chapter3/prefixes.html |date=2011-10-14 }}</ref> It is equal to one quintillionth of a [[second]] (or 0.000000000000000001&nbsp;seconds). It can also be written as '''10⁻¹⁸ seconds'''. Because it can be hard to think about how short this period of time is, on this page is a list of descriptions of periods of time longer than 1 attosecond, but shorter than one [[femtosecond]] (which is 10⁻¹⁵ seconds). This should help when thinking about periods of time that have different [[order of magnitude|orders of magnitude]].

* 1 attosecond: It takes 1 attosecond for light to travel the length of three [[hydrogen|hydrogen atoms]].

* 1 attosecond: It takes 1 attosecond for light to travel the length of three [[hydrogen|hydrogen atoms]].

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[[Category:Units of time]]

[[Category:Units of time]]

[[Category:Orders of magnitude]]

[[Category:Orders of magnitude]]