Activity: 5W–1H Chapter Lens (Physical Quantities and Measurement)
Scientists and students measure physical quantities in daily life and experiments.
Physical quantities are measurable properties like length, mass, time, and temperature.
Measurements are used at home, in schools, laboratories, and daily activities.
Measurement is needed whenever we compare, calculate, or observe objects.
To make observations accurate and express them in standard units.
By using proper instruments and standard units.
Three Important Takeaways
Length, mass, and time are basic physical quantities.
Each physical quantity has a standard unit and symbol.
Correct instruments give accurate measurements.
Key Exam Facts
SI unit of length is metre (m).
SI unit of mass is kilogram (kg) and time is second (s).
Temperature is measured using a thermometer.