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SI units and physical quantities
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What makes a measurement meaningful?

What makes a measurement meaningful?

A physical quantity is something that can be measured and written as a number with a unit. Saying "length = 2.0" is incomplete, because 2.0 m2.0\text{ m}2.0 m, 2.0 cm2.0\text{ cm}2.0 cm and 2.0 km2.0\text{ km}2.0 km are all fundamentally different values.

SI units and physical quantities Lesson

  1. AS Level
  2. /Physics
  3. /SI units and physical quantities

Step-by-step lessons on Edexcel AS Level Physics SI units and physical quantities. Each one builds up to exam-style questions.

Lessons