# Measurements

### Measurements – Learning Objectives

At the end pf this chapter the students will be able to:

1.Understand what is Physics.
2. Understand that all physical quantities consist of a numerical magnitude and a unit.
3. Recall the following base quantities and their units; mass (kg), length (m), time (s), current (A), temperature (K), luminous intensity (cd) and “amount of substance (mol).
4. Describe and use base units, supplementary units, and derived units.
5. Understand and use the scientific notation.
6. Use the standard prefixes and their symbols to indicate decimal sub-multiples or multiples to both base and derived units.
7. Understand and use the conventions for indicating units.
8. Understand the distinction between systematic errors and random errors.
9. Understand and use the significant figures.
10. Understand the distinction between precision and accuracy.
11. Assess the uncertainty in a derived quantity by simple addition of actual, fractional or percentage uncertainties.
12. Quote answers with correct scientific notation, number of significant figures and units in all numerical and practical work.
13. Use dimensionality to check the homogeneity of physical equations.
14. Derive formulae in simple cases using dimensions.