Virtual Lab

Surface Tension of water and kerosine by drop weight method

To find the surface tension of kerosene by dropweight method

Stalagmometer, rubber balloon, Stand with clamp, weighing balance, Distilled water, Kerosene

Rubber balloon

Distilled water

Kerosene

Stalagmometer

Stand with clamp

Weighing balance

Choose the experiment :

Weight of empty beaker :

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

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Note:- Allow 20 drops of liquid fall into the beaker.

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

Liquid	Weight of 20 drops (g)		(x2 - x1)g
Liquid	Weight of empty beaker (x1)	Weight of beaker with liquid(x2)	(x2 - x1)g
Water	48.20	53.8	w1 = 5.6

Liquid	Weight of 20 drops (g)		(x2 - x1)g
Liquid	Weight of empty beaker (x1)	Weight of beaker with liquid(x2)	(x2 - x1)g
Kerosene	48.20	50.123	w1 = 1.923