Pressure in Liquids and Gases
2 marks · EasyA glass tube is sealed at one end and filled with water. Three small holes are made at the same depth but on different sides of the tube.
Predict what happens when the holes are opened.
Explain what this tells you about the pressure in liquids at a given depth.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) Water squirts out equally from all holes, in different directions depending on their position.
(b) Pressure at the same depth in a liquid is the same everywhere and acts equally in all directions.
Common mistakes: Answers that say only the bottom hole squirts.
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Marking points
B1 (a) · 1 mark · States water will squirt equally from all holes/same distance or with equal force in different directions.
B1 (b) · 1 mark · Explains this means pressure at a certain depth is the same in all directions/points.
Worked solution
a) Water comes out equally from all holes at the same depth.
b) This shows that the liquid pressure is the same at every point at the same depth and in all directions.