viscosity of liquid

Content of this page :

1.    Introduction of the experiment.

2.    Aim of the experiment.

3.    Tools of the experiment.

4.  Steps and methods of the experiment.

5.    Parameter, Theory and Final law of the experiment.

6.    Table of The Readings.

7.    Medical application and advantages of the experiment.

1. Introduction of the experiment:

Viscosity is a measure of the resistance of a fluid which is being deformed by either shear stress or tensile stress. In everyday terms (and for fluids only), viscosity is “thickness”. Thus, water is “thin”, having a lower viscosity, while honey is “thick”, having a higher viscosity, viscosity is also defined as the resistance of a fluid (liquid or gas) to a change in shape or movement of neighboring portions relative to one another.

2. Aim of the experiment:

-To deduce the coefficient of viscosity for a liquid.

3-Tools of The experiment

·       A long glass tube about 50 cm long closed at one end.

·       Liquid.

·       Meter Scale.

·       Small Sphere.

·       Magnet.

·       Stop-Watch.

·       Rubber Band.

4. Steps and methods of the experiment:

Adjust the distance between the rubber bands.

1-Recored the distance (h) between them (30cm).

2-Drop a sphere centrally down the tube.

3-With the stop-watch find the time it takes to traverse the distance between the two bands.

4-Obtain two values of the time of fall and take the mean t-mean.

5-Repeat for different values of (h).


5-ParametersTheory And Final Law of The experiment


ρ= Density of the sphere

d= Diameter of the sphere

σ= Density of liquid


v= Velocity


Slope= h/t = velocity cm/sec

Final Law:

Viscosity of liquid:

6. Table of the Readings:

7 -Medical Application:

Viscosity of blood increases as the hematocrit increases. Such as the disease “polycethemia vera” , and the viscosity increases as temperature decreases and there will be less blood supply to cold hands and feet.


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