What is Femtosecond?
A '''femtosecond''' is one billionth of one millionth, or one quadrillionth of a [[second]]. It can be written as '''10<sup>-15</sup> second'''. Even shorter than this is an [[attosecond]]. * 200 femtoseconds - the fastest [[chemical reaction]]s * 300 femtoseconds - how long it takes for the atoms of an [[iodine]] [[molecule]] to vibrate {{Ordersofmagnitudeseconds}} [[Category:Orders of magnitude]] [[Category:Units of time]] {{Math-stub}}