Density (GCSE) — GCSE Physics Revision
Revise Density (GCSE) for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to States of MatterWhat is Density (GCSE)?
Density is a measure of how much mass is packed into a certain volume. It is defined as mass per unit volume. A dense material has a lot of mass in a small space. The formula for density is ρ = m/V, where ρ is density, m is mass, and V is volume.
Board notes: A core concept in all GCSE Physics specifications (AQA, Edexcel, OCR). Practical methods for measuring density are often tested.
Step-by-step explanationWorked example
A block of wood has a mass of 400g and a volume of 500cm³. What is its density? Solution: Density = Mass / Volume. ρ = 400g / 500cm³ = 0.8 g/cm³.
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Common mistakes
- 1Confusing density with weight. A small, dense object can be heavier than a large, less dense object.
- 2Using the wrong units. The standard unit for density is kilograms per cubic metre (kg/m³), but grams per cubic centimetre (g/cm³) is also commonly used.
- 3Incorrectly calculating the volume of an irregular object. The displacement method (submerging the object in water and measuring the volume of water displaced) is used for this.
Density (GCSE) exam questions
Exam-style questions for Density (GCSE) with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Density (GCSE)
Core concept
Density is a measure of how much mass is packed into a certain volume. It is defined as mass per unit volume. A dense material has a lot of mass in a small space. The formula for density is ρ = m/V, w…
Frequently asked questions
How do you measure the density of an irregular object?
First, measure the mass of the object using a balance. Then, find its volume by submerging it in a eureka can filled with water and measuring the volume of water that is displaced into a measuring cylinder. Finally, use the formula density = mass/volume.
Why does a hot air balloon rise?
Heating the air inside the balloon makes it less dense than the cooler air outside. This difference in density creates an upward buoyancy force, causing the balloon to rise.