Measurement

What is measurement, why is it important and how do we measure things?

1. Presented by: Hiba Khan Hirah Ismail Maham Nizamani Vareesha Ali on 02-09-2016

2. Introduction Measurements and M easurement Systems are today’s most important and useful topics to learn, discuss and identify. So, in order to take perfect measurements, we need to measure correctly and for that we must know the measuring procedure and measuring systems.

3. Definition Measurement: Measurement is finding a number that shows the size or amount of something. Systems of Measurement : there are two main  systems of measurement  in the world: the Metric (or decimal)  system  and the US standard  system . In each  system , there are different units for  measuring  things like volume and mass.

4. Metric System of Measurement The metric system is a system of measuring. It has 3 basic units: m the meter for length kg the kilogram for mass s the second for time All the other units are derived from these 3 basic units.

5. US Standard System United States Standard System   is a  system of measurements  commonly used in the  United States . The  US Standard System developed from English units  which were in use in the  British Empire  before American independence. However, the British system of measures was overhauled in 1824 to create the  imperial system , changing the definitions of some units. Therefore, while many U.S. units are essentially similar to their Imperial counterparts, there are significant  differences between the systems .

6. International System of Units The modern form of the metric system is known as the International System of Units and is the most widely used  system  of measurement. It comprises a coherent  system of units  of measurement built on seven base  units . Metre for length Kilogram for mass Second for time Ampere for electric current Kelvin for temperature Candela for luminous intensity Mole for amount of substance

7. We can measure many different things, but mostly we measure Length, Area, Volume, Mass and Time. Length : Distance from end to end. Eg: Height of Hirah Ismail is 5 feet 1 inches.

8. Area : The extent or measurement of a surface. Eg : Area of human brain is 1130 centimeter squared.

9. Mass : Mass is the measure of how much matter is in an object . Eg: Hirah has mass of 5.306 kg Weight: The product of mass and gravitational pull. Eg: Weight of Hirah is 5.306*9.8 = 52 newtons

10. Volume: The amount of space (3 dimensional) that an object or substance occupies. Eg: Hirah has 4.65 cubic metres of blood in her body.

11. Time: The indefinite continued progress of existence and events in the past, present, and future regarded as a whole . Eg: Hirah’s heart rate is 99 to 105 beats per minute.