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Particle ModelIntroduction

The Suitcase Test

Part of Density · GCSE GCSE Physics revision

This introduction covers The Suitcase Test within Density for GCSE Physics. Revise Density in Particle Model for GCSE Physics with 13 exam-style questions and 30 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 1 of 13 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 1 of 13

Practice

13 questions

Recall

30 flashcards

📖 The Suitcase Test

Imagine two identical suitcases — one packed with feathers, the other with bricks. Same size, VASTLY different weights. That difference is density in action. Density tells you how much mass is "packed into" a given space. A small gold ring and a massive gold bar have the SAME density because they're made of the same stuff — density is a property of the MATERIAL, not the object. This is why ships made of steel (density 7800 kg/m³) can float — they're mostly filled with air, making their OVERALL density less than water!
Density Equation
ρ = m / V
Density (kg/m³) = Mass (kg) ÷ Volume (m³)

Keep building this topic

Read this section alongside the surrounding pages in Density. That gives you the full topic sequence instead of a single isolated revision point.

Understanding Density at the Particle LevelKey Density ValuesRequired Practical: Measuring Density

Practice Questions for Density

What is the correct equation for density?

  • A. Density = volume ÷ mass
  • B. Density = mass × volume
  • C. Density = mass + volume
  • D. Density = mass ÷ volume
1 markfoundation

Explain why gases have a much lower density than solids, using ideas about particles.

2 marksstandard

Quick Recall Flashcards

Density equation
ρ = m/V
What is density?
Mass per unit volume of a substance. How much 'stuff' is packed into a given space.

13 questions on Density — practise free

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Understanding Density at the Particle Level