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Unit and

Units -A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a for measurement of the same kind of quantity. Any other quantity of that kind can be expressed as a multiple of the unit of measurement. Every quantity is represented with a unit, which is very useful in our daily life .

Units of Counting Things

➢ 2 units = 1 pair ➢ 20 unit = 1 score ➢ 12 units = 1 dozen ➢ 24 sheets = 1 quire ➢ 20 quire = 1 ream

METRIC The is a system of measuring. It has three main units:

m the meter for kg the kilogram for mass s the second for time

With those three simple we can measure nearly everything in the world!

UNIT OF METRIC SYSTEM –

International name of main unit of metric system are as follow –

➢ Length= 1 meter (m) ➢ =1 (gm) ➢ Time =1 second (sec) ➢ Area = 1 sq cm or 1 sq m ➢ Volume =1 cubic cm or 1 cubic m

Multiple and submultiple of metric unit

Multiple

Name Sign Value deca d 101 hecto h 102 kilo k 103 Submultiple deci d 10−1 centi c 10−2 milli m 10−3

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MEASUREMENT

We represent different type of quantities with different units. These units measure the quantities of the things and help us to compare it with other things .

Measurement can be sub divided into following systems-

1-Measurement of Length

2-measurement of weight

3- Measurement of Time

4- Measurement of Area

5- Measurement of Measurement of volume

1-Measurement of Length and conversion –

3 Example -convert 푚 into . 5 Solution- 1 m= 100 cm

3 3 푚= × 100푐푚 = 60푐푚 5 5

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MEASUREMENT OF WEIGHT

Weight is the measure of how heavy an object is. Weight is measured in standard customary units.

The mass of an object is the amount of material it contains. Mass is measured in standard .

For everyday purposes, when you're on the surface of the earth, the difference is not important. But if you measure something on another planet, its mass will be the same as it is on earth—but its weight will be different. (Weight depends on gravity, and gravity is different on other planets! This is why when you're floating in space, you're weightless. You still have mass, though,)

Measure of quantity in metric system

➢ 1 metric = 10 quintal ➢ 1 quintal = 100 kilogram(kg) ➢ 1 kilogram(kg)=10 hectogram (hg) ➢ 1 hectogram (hg)= 10 decagram (dag) ➢ 1 decagram (dag)= 10 gram (gm) ➢ 1 gram (gm) =10 decigram(dg) ➢ 1 decigram (dg)=10 centigram(cg) ➢ 1 centigram (cg)=10 milligram(mg) ➢ 1 kilogram(kg)=1000 gram (gm)

CONVERSION BETWEEN ENGLISH AND METRIC SYSTEM

English Metric Conversion 1 ounce 28.35 gm 1 453.59 gm Others weight conversion 16 ounce 1 pound 2000 pound 1 tonne 1000 kg 1 tonne

Measure of liquid substance in metric system

➢ 1 kilolitre(kL)= 10 hectolitre (hL) ➢ 1 hectolitre (hL)= 10 decalitre(daL) ➢ 1 decalitre(daL)= 10 litre(L) ➢ 1 litre(L) =10 decilitre(dL) ➢ 1 decilitre(dL)=10 centilitre(cL) ➢ 1 centilitre (cL)= 10 millilitre(mL)

Conversion from capacity to volume

1 litre 1000 cubic centimetre 1/1000 cubic meter 1 litre 1 cubic 1 litre

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Measurement of Time –

Time can also be measured with the help of the speed of any body and the distance covered up with that speed i.e.

푑푖푠푡푎푛푐푒 푡푖푚푒 = 푠푝푒푒푑

The unit of speed may be in terms of m/s or in the terms of km/h

Unit of Time

The smallest unit of time is second, which is 1/60th part of 1 . i.e. 1 min = 60 sec and 1 = 60 min

Measure of Time

Units of time conversion chart are discussed here in hour, minute, second, , week, month, and year.

The standard units of time are

1 hour = 60

1 minute = 60 seconds

1 hour = 60 minutes = 3600 seconds (60 × 60)

1 day = 24

1 week = 7 days

1 year = 365 days

1 year = 12 months

1year = 52 weeks

100years = 1 century

These are the units of time conversion table.

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