what are advantages if using SI units?
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1.Astronomical Unit (A.U.) : The average distance between the centre of the sun to the centre of the earth is known as one A.U. 1 A.U. ...
2.Light Year (l.y.) : One light year is the distance travelled by light in vacuum in one year. 1 l.y. ...
3.Par sec (Parallactic Second): One Par sec is the distance at which an arc of 1A.U.
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The greatest advantage of SI is that it has only one unit for each quantity (type of measurement). This means that it is never necessary to convert from one unit to another (within the system) and there are no conversion factors for students to memorize. For example, the one and only SI unit of length is the metre (m)
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