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# Surface Tension of Water by the Capillary Tube Method

الكلية كلية طب حمورابي     القسم الكلية ذات القسم الواحد     المرحلة 1
أستاذ المادة نادية حسين صاحب طاهر       13/11/2016 15:26:45
Name of Exp.: Surface Tension of Water by the Capillary Tube Method.

Purpose: Determine the Surface Tension of Water.

Apparatus:
1.Set of one clean glass capillary tubes of diameter (0.5) mm.
2.Traveling Microscope.
3.Beaker full of water.
4.Stand and clamp.
5.Thermometer.

Method:
1.Select the capillary tube of medium bore and attach bent pin to it
by means of a rubber band.
2.Hold the capillary tube in a clamp with its lower end immersed
in the water.
3.Adjust the position of the bent until its point touches the water surface.

4.Focus the microscope on the meniscus of water level in the capillary tube and adjust the microscope until the horizontal cross –wire is tangential to the bottom of the meniscus which is of course seen inverted in the eyepiece of the microscope.

5.Read the position of the travelling microscope on its vertical scale (h1).

6.Record the position of travelling microscope on its vertical scale (h2).

7.Measure the internal diameter (d) by the travelling microscope, taking the mean of two diameters at right angles.

8.Record the temperature of the water.

h= h1 -h2 cm.
(h1)cm for Tube, height water surface (h2)cm.

Diameter (d1)mm.
Diameter (d2)mm.
Mean diameter(d)cm

Calculate:
? = 1 /4 d h ? g (N/m)
? = Surface tension
d= Diameter of tube.
h = Height of water.
? = Density if water.
g = Acceleration.

Discuss:
1.Define the Surface Tension.
2.Explain the errors and accuracy when the measurements.
3.Discuss the case of Respiratory Distress Syndrome (RDS), sometimes called hyaline membrane disease.