TOPIC 03-MEASUREMENT
Measurement is the process of assigning numbers to observations or events.
It comes from Greek word โMetronโ which means โLimited proportionโ
Measurement is done through comparing the known and unknown quantity. Eg. Length of a table and Meter ruler, mass and slotted Masses
Every measurement has two parts, namely:
- Number or Numerical part-Magnitude in comparison
- Unit part-Represents a quantity measured.
PHYSICAL QUANTITIES
Physical quantity is a property of a material that can be quantified by measurement.
There are two types of physical quantities,namely.
- Fundamental quantities
- Delivered quantities
Fundamental Quantities
Are the basic physical quantities which cannot be obtained from other physical quantities. These include;Mass, Length, Time etc.
Fundamental Quantities and their SI Unit
Quantities | SI unit | Unit symbol |
|---|---|---|
Length | Metre | m |
Mass | Kilogram | kg |
Time | Second | S |
Electric current | Ampere | A |
Temperature | Kelvin | K |
Amount of substance | Mole | mol |
Luminous intensity | Candela | Cd |
The physical quantities can further be classified into two types, namely;
- Vector Quantities
- Scalar Quantities