3.1 PRESSURE IN LIQUIDS Experiment 1: Water pressure and depth Inference : is depend by ..Hypothesis: The greater the , the greater the. Aim of the experiment: To find the relationship between the pressure in a liquid according to its depth Variables:Manipulated: Depth of liquid Responding: Pressure in liquid Constant: Density of liquid Apparatus and Materials: Measuring cylinder, thistle funnel, rubber tube, manometer, metre rule

Diagram (a) Diagram 9(b Procedure: 1. Apparatus is set up as shown in the diagram.2. The measuring cylinder is completely filled with water. 3. The thistle funnel is lowered into the water to a depth of 5.0 cm. The manometer reading is measured. The difference in the liquid heights in the manometer represent the pressure reading. 4. Step 3 is repeated with values of depth 10.0 cm, 15.0 cm, 20.0 cm and 25.0 cm.Results :Depth , d / cmReading of manometer , h /cm

5.0

10.0

15.0

20.0

25.0

Analysis: A graph of pressure against depth is drawn. Conclusion: It is observed that the manometer reading increases as the depth of the thistle funnel increases. This shows that the pressure increases with the depth of the liquid.