Contents
Part 2 of 2
Pressure in liquids
identify
Try it yourself
The densities of three liquids are: olive oil 920 kg/m³, water 1000 kg/m³ and glycerol 1260 kg/m³. Each row of the table describes two points, P and Q, in liquids at rest. Which row correctly shows where the pressure of the liquid is greater?
identify: name or select.
| Row | Point P | Point Q | The pressure is greater at |
|---|---|---|---|
| A | 0.50 m below the surface of glycerol | 0.50 m below the surface of water | neither: it is the same |
| B | 0.35 m below the surface of water | 0.35 m below the surface of olive oil, in a much wider tank | Q |
| C | 0.55 m below the surface of olive oil | 0.70 m below the surface of glycerol | Q |
| D | 0.25 m above the bottom of a tank of water 1.2 m deep | 0.25 m above the bottom of a tank of water 0.50 m deep | neither: it is the same |
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Scope and sources
Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.
Pressure as force per unit area, p = F/A (1.8.1); how pressure varies with force and area in everyday examples (1.8.2); qualitatively, how the pressure beneath the surface of a liquid changes with depth and with the density of the liquid (1.8.3); Supplement: the change in pressure beneath the surface of a liquid, ∆p = ρg∆h (1.8.4). Atmospheric pressure beyond one sentence, hydraulics, upthrust and floating are not covered; gas pressure is in Gas pressure.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus