Part 3 of 3

Float or sink

identify

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Water has a density of 1.00 g/cm³. Which of these objects float in water?

Choose all statements you think are correcta.a cork (0.24 g/cm³)b.a candle (0.90 g/cm³)c.a glass marble (2.5 g/cm³)d.a block of oak (0.75 g/cm³)e.a small aluminium washer (2.7 g/cm³)

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Scope and sources

Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.

Mass and weight, gravitational field strength g = W / m and comparing masses on a balance (1.3.1–1.3.5), density ρ = m / V, measuring the density of a liquid, a regular solid and an irregular solid that sinks, and predicting from density data whether an object floats or one liquid floats on another (1.4.1–1.4.4). Forces and their effects are in FORCE01; pressure in liquids is in PRES01.

Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.

Official Cambridge syllabus