Surface Tension of water and kerosine by drop weight method

Objective controls

To find the surface tension of kerosene by dropweight method.

Rubber balloon Rubber balloon
Distilled water Distilled water
Kerosene Kerosene
Stalagmometer Stalagmometer
Stand with clamp Stand with clamp
Weighing balance Weighing balance
weighing balance
Stalagmometer Stalagmometer Stalagmometer Distilled water Stalagmometer Kerosene beaker

48.20

50

clamp
Beaker Drop Drop Beaker
clamp clamp Beaker
Note:- Allow 20 drops of liquid fall into the beaker.
weighing balance weighing balance Beaker Beaker

Liquid Weight of 20 drops (g) (x2 - x1)g
Weight of empty beaker (x1) Weight of beaker with liquid(x2)
Water 48.20 53.8 w1 = 5.6
Liquid Weight of 20 drops (g) (x2 - x1)g
Weight of empty beaker (x1) Weight of beaker with liquid(x2)
Kerosene 48.20 50.123 w1 = 1.923
Liquid Weight of 20 drops (g) (x2 - x1)g Surface Tension (Dynes/cm)
Weight of empty beaker (x1) Weight of beaker with liquid(x2)
Water 48.20 53.8 w1 = 5.6 γ1 = 72.8
Kerosene 48.20 50.123 w1 = 1.923 γ2 = 25

Instructions

  1. Select the "Distilled water" from 'Select the experiment' dropdown menu.
  2. Find the weight of empty beaker in grams.
  3. Distilled water (reference liquid) is sucked into the stalagmometer (till point A) using a rubber bulb attached to the mouth of stalagmometer.
  4. Allow 20 drops of water to fall inside the beaker by clicking on the "OK" and again weigh the weight of the beaker with liquid.
  5. Click on the 'Observation' button to view the table.
  6. Change the procedure to "Kerosene" to calculate the dropping weight of kerosene.
  7. Click on the 'Start' button to start the experiment.
  8. Allow 20 drops of kerosene to fall inside the beaker and again weigh the weight of the beaker with liquid.
  9. Click on the 'Observation' button to view the table.
  10. Click on the 'Show Result' button to view the result.

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