Lesson 2, Topic 5
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# Linear Measurements

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Units of length: The basic unit of length measurements in metric unit in metre (m).

1 millimetre (mm) = $$\frac{1}{1000m} \scriptsize = 10^{-3}m$$

1 centimetre (cm)  = $$\frac{1}{100m}\scriptsize = 10^{-2}m$$

1 decimetre (dm)   =   $$\frac{1}{10}\scriptsize = 10^{-1}m$$

1 decametre (Dm)  = 10m = 101m

1 hectometre (Hm) = 100m = 102m

1 kilometre (Km)  = 1,000m = 103m

### Length Measuring Tools:

1. Scale rulers: A ruler is either made of steel, plastic, or wood and is normally graduated in centimeters (cm). Each centimeter(cm) is sub-divided into ten divisions to give 0.1cm or each division of 1mm. Standard lengths of rulers are normally 30cm, 500cm, or 1.0m.

2. Measuring Tapes: Measuring tapes are usually used for measuring longer distances and are used mostly by tailors, bricklayers, carpenters, surveyors, etc. Measuring tapes are made of steel or cloth, graduated in centimeters, with or without sub-divisions in millimeters.

The length of the tapes varies and they include 60cm (tailor’s measuring tape), 300cm (carpenter’s measuring tape), and 5m to 50m (bricklayer’s measuring tape). The graduated tapes are usually housed in steel or plastic cases when not in use.

### Measurements of Volume:

Units of volume: The basic unit of volume is litre (L). Other units commonly used are the cubic centimeter (c.c or cm3) and millimeter (ml).

1 millimetre (ml) = 1c.c

1 centilitre (cl) = $$\frac{1}{10^2}$$ litre = 10ml

1 litre (L) = 1000ml = 1000cc

Conversion units are:

1cm3  =  1c.c  =  1ml  =  10mm x 10mm x 10mm = 103mm3

1m3      =  100cm  x  100cm  x  100cm  =  106cm3

1m3    =  10dm  x  10dm  x  10dm  =  103dm3 error: