Pressure in Liquids and Gases
2 marks · EasyA plastic bottle has four small holes at the same height, equally spaced around its side. The bottle is filled with coloured water.
Describe what you observe as water flows from all four holes.
Explain why this observation shows that liquid pressure acts equally in all directions at a point.
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.
Show answer
(a) Water streams out equally from all the holes
(b) The water comes out equally in all directions, showing pressure is the same at that height in all directions.
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · States water streams equally/similarly from all holes.
B1 (b) · 1 mark · Explains observation shows pressure is the same in all directions at that level/height.
Worked solution
a) Water streams come out equally from all four holes.
b) This shows that liquid pressure at the same depth acts equally in all directions, because the water is forced out sideways with equal force.