Introduction to Physical Quantities and Measurement

Introduction to Physical Quantities and Measurement

1. WHO IS TALLER? HOW TALL AM I? MEASUREMENT Measurement is a comparison of an unknown quantity with a known fixed quantity of the same kind.

2. PHYSICAL QUANTITIES AND MEASUREMENT LENGTH MASS TEMPERATURE AREA TIME

3. IMPORTANCE OF MEASUREMENT

4. PHYSICAL QUANTITIES MASS TIME TEMPERATURE VOLUME LENGTH A quantity that can be measured .

5. PHYSICAL QUANTITIES Fundamental Quantities Derived Quantities Do not depend on other quantities Obtained by combining two or more fundamental quantities Eg . Mass, length, time, temperature Eg . Area (length X breadth) Density (mass/volume) Speed (distance/time)

6. Measurement of a Physical Quantity 1 2 A unit (u) a known fixed quantity A numerical value (n) a number that indicates how many times the unit is present in that fixed quantity. Example Example 30 centimetres 5 kilograms

7. HOME WORK What is measurement? How is a measurement expressed? Name four basic measurement in our daily life.