User:Milton Beychok/Sandbox: Difference between revisions
Jump to navigation
Jump to search
imported>Milton Beychok No edit summary |
imported>Milton Beychok No edit summary |
||
| Line 1: | Line 1: | ||
'''“Parts-per” notation''' is used in [[science]] and [[engineering]], to denote proportionalities in measured quantities such as proportions at the parts-per-million ('''ppm'''), parts-per-billion ('''ppb'''), and parts-per-trillion ('''ppt''') level. Since parts-per notations are quantity-per-quantity measures, they are known as ''dimensionless quantities''; that is, they are pure numbers with no associated [[measurement|units of measurement]]. | |||
Revision as of 17:33, 9 August 2008
“Parts-per” notation is used in science and engineering, to denote proportionalities in measured quantities such as proportions at the parts-per-million (ppm), parts-per-billion (ppb), and parts-per-trillion (ppt) level. Since parts-per notations are quantity-per-quantity measures, they are known as dimensionless quantities; that is, they are pure numbers with no associated units of measurement.