As our scientific and technical knowledge has increased, so has our need for ever-smaller and ever-larger units of measure. The prefixes used to denote some of these units of measure are listed in the table below.

Prefixes for large units	10n	Prefixes for smaller units	10n
Name	Symbol	Name	Symbol
yotta	Y	1024	yocto	y	1024
zetta	Z	1021	zepto	z	1021
exa	E	1018	atto	a	1018
peta	P	1015	femto	f	1015
tera	T	1012	pico	p	1012
giga	G	109	nano	n	109
mega	M	106	micro		106

These new units of measure are quickly working their way into our everyday lives. For example, it is quite easy to purchase a 1-terabyte hard drive. One terabyte (TB) is equal to 10¹² bytes. As another example, many computers can do multiple operations in 1 nanosecond (ns). One nanosecond is equal to 10⁹ s.In the 1980s, it became possible to measure optical events in nanoseconds and picoseconds. Express 1 ps as a decimal.