HomeFrequently Asked Questions (FAQs)FAQs PhysicsFAQs Physics: Physical Quantities, Units and Measurements FAQs Physics: Physical Quantities, Units and Measurements 1500 ~ What are the orders of magnitude of the sizes of some common objects? ~ What is a physical quantity? ~ What is a vector quantity? Give some examples. ~ What is a scalar quantity? Give some examples. ~ What are the 7 base quantities?