Applied Physics I: Chapter 2: Properties of Matter - Viscosity and Surface Tension
Experimental determination of Surface Tension by Drop Weight Method
The liquid for which the surface tension is to be determined is filled in the stalogmometer by suction using suction pump.
EXPERIMENTAL
DETERMINATION OF SURFACE TENSION BY DROP WEIGHT METHOD
The
experimental set up consists of Stalagmometer in which a suction pump is
connected at the top end and short glass capillary tube is connected at the
bottom end of the stalagmometer as shown in Fig.2.6.
The
liquid for which the surface tension is to be determined is filled in the
stalogmometer by suction using suction pump. The rate of fall of liquid is
adjusted using the clamped rubber tube in such a way that the liquid drops are
formed very slowly in the outlet of the short glass capillary tube and falls in
the beaker.
The
time taken for the drops (say 20 drops) to fall from the short glass capillary
tube to beaker is noted. The weight of the empty beaker and the beaker along with
20 drops are noted, from which the weight of 20 drops is calculated.
From
the above, the weight (mg) of one droplet is calculated.
Now,
by finding the inner radius (r) of
the short glass capillary tube and by substituting the values of the weight
(mg) of a single droplet and the inner radius (r) in the given formula,
i.e.,
σ = mg / 3.8r
the
surface tension of the liquid shall be determined.
Applied Physics I: Chapter 2: Properties of Matter - Viscosity and Surface Tension : Tag: Applied Physics : - Experimental determination of Surface Tension by Drop Weight Method
Applied Physics I: Chapter 2: Properties of Matter - Viscosity and Surface Tension
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