Cambridge Secondary (7-9). Stage 8. Science. Learner's Book - Unit 3: Forces and energy - Question 118

Think like a scientist: Observing the effects of pressure. Part 1: Pressure and depth in liquids. In this investigation, you will observe the effect of pressure increasing with depth in water. Work in groups of two or three. You will need: 1- or 2-litre empty plastic bottle; adhesive tape; something to make small holes in the side of the bottle; large tray or sink to collect water. Method: 1 Make three small holes in the side of the bottle at different heights. Try to make the holes the same size. 2 Predict what will happen when the bottle is filled with water. 3 Now use one piece of adhesive tape to cover all the holes. 4 Place the bottle in the tray or the sink. 5 Fill the bottle with water, but do not put the lid on the bottle. 6 Pull off the adhesive tape to open the holes. 7 Watch what happens.

Predict what will happen when the bottle is filled with water.