# Physics -Measurement

Jun 17th, 2015
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Measurement is the process or the result of determining the magnitude of a quantity, such as length or mass, relative to a unit of measurement, such as a meter or a kilogram. The word measurement stems, via the Middle French term mesure, from Latin mēnsūra, and the verb metiri.

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TerminologyA ruler used to be called a rule, and rulers would be rules. Today, the more commonly found term is ruler. The dictionary defines both the term rule and ruler, so either can be used, and for this document I will only use the term ruler.Metric RulersMetric rulers are fairly easy to read. They deal with centimeters and millimeters only. You wont have to worry much about fractions.Take a look at the following Metric Ruler.Metric RulerThe larger lines with numbers are centimeters, and the smallest lines are millimeters. Since millimeters are 1/10th of a centimeter, if you measure 7 marks after a centimeter, it is 1.7 centimeters long.English RulersEnglish rulers, are much more difficult to read. Mostly because they deal with fractions, which are a bit more dificult to learn.Take a look at the following English Rulers.English RulerA ruler marked in 8ths. Every mark is 1/8th of an inch.English RulerA ruler marked in 16ths. Every mark is 1/16th of an inch.The center mark between numbers is 1/2.The red lines on these rulers are marked at 1/2, and 1.Ruler Marked in 1/2sRuler Marked in 1/2sThe next smallest marks on a ruler are 1/4ths.The red marks on these rulers are at 1/4, 1/2, 3/4, and 1. (1/2 is the same as 2/4)Ruler marked in 1/4thsRuler marked in 1/4thsThe next smallest marks on a ruler are 1/8ths.The red marks on these rulers are at 1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 7/8, and 1.Ruler marked in 1/8thsRuler marked in 1/8t

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