Physical quantities and units

What you'll learn

• Understand that all physical quantities consist of a numerical magnitude and a unit.
• Make reasonable estimates of physical quantities included within the syllabus.
• Recall the SI base quantities and their units: mass (kg), length (m), time (s), current (A), temperature (K).
• Express derived units as products or quotients of SI base units and use them appropriately.
• Use SI base units to check the homogeneity of physical equations.
• Recall and use prefixes and their symbols for decimal submultiples or multiples of units.
• Understand and explain the effects of systematic and random errors in measurements.
• Understand the distinction between precision and accuracy.

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