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Surface Tension of water using Capillary Rise Method : Part 1/3

Explained in Hindi SURFACE TENSION Object: To determine the surface tension of a liquid (water) by the capillary rise method. Apparatus Used: Capillary tube, traveling microscope, water, beaker, and wooden vertical supporting stand. PROCEDURE: 1) Take a capillary tube already cleaned in a solution of caustic soda to remove grease etc. and thoroughly washed in running water and dry it. 2) It is then fixed vertically and dipped in the beaker as mentioned in the description of the apparatus. 3) By means of a traveling microscope M, the reading of the water surface in the beaker is noted. 4) The microscope is now focused on the lowest point on the surface of the meniscus of water in the capillary tube. The difference between this reading and the previous reading gives the height of water raised in a capillary tube. 5) The tube is then removed and cut at the point where the meniscus was standing. Then its diameter is measured by focusing the cross wire of the microscope on its ends. 6) The temperature of the liquid is measured and its density ρ at this temperature is noted from the table of constants. 7) The experiment is repeated for different capillary tubes. PRECAUTION AND SOURCES OF ERROR: 1) The tube must be vertical. 2) Capillary tube must be clean and dry. 3) Capillary tube should be of a uniform bore. 4) The diameter of the tube must be measured very accurately in two perpendicular directions at the point up to which the liquid rises. #surface_tension_experiment #capillaryaction #capillary #capillary_rise #surface_tension #surface_tension_of_water #travelling_microscope #capillary_tube #capillary_rise_method #physics_experiments #physics_experiment_videos #physics_practicals