# A student submerges a small stone in a tank of seawater. The stone sinks to the bottom of the tank. Explain why the pressure acting on the stone increases as it sinks deeper into the seawater.

> Pearson Edexcel International GCSE Physics (4PH1) — 5.1 Density and pressure · Explain · 4 marks

> Seawater has a greater density than fresh water. The tank is open at the top.

## Mark scheme (4 marks)

1. Pressure in a liquid increases with depth
2. There is a greater weight / column of liquid above the stone at greater depth
3. Pressure also depends on the density of the liquid
4. Pressure acts equally in all directions at any point in the liquid

## Key terms

- [pressure](https://www.gradenine.co.uk/glossary/pressure)

## Related

- [Revision notes for Pearson Edexcel International GCSE Physics (4PH1)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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Source: [GradeNine](https://www.gradenine.co.uk/q/a-student-submerges-a-small-stone-4b69c921) · Published by Druglandscape Ltd.