CAIE IGCSE Physics 1.8.4 Recall Use for the Change in Pressure Questions

Practise applying p = ρgh and related pressure equations to liquids, gases, manometers and barometers with CAIE IGCSE Physics questions and mark schemes.

Exam points

Apply p = ρgh and related pressure equations to liquids, gases, manometers and barometers.

[Maximum number: 2]

Fig. 4.1 shows a bottle part-filled with water. The air inside the bottle is at the same pressure as the air outside the bottle. The bottle and its contents are at room temperature.

Fig. 4.1

Another plastic bottle is filled to the top with water. The height of the bottle is 40.0 cm . The density of water is $1.0 \times 10^{3} \mathrm{~kg} / \mathrm{m}^{3}$ .

Calculate the pressure difference between the top and bottom of the water.

pressure difference =

3900 Pa
$\begin{aligned} (\Delta p=) \rho \mathrm{g}(\Delta) h \text { OR }(\Delta p=) 1.0 \times 10^{3} \times 9.8 \times 0.4 \text { OR } (\Delta p=) 1.0 \times 10^{3} \times 9.8 \times 40 \text { OR }(\Delta p=) 3.9 \times 10^{\mathrm{N}} \end{aligned}$

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CAIE IGCSE Physics 1.8.4 Recall Use for the Change in Pressure Questions question 1