Investigating Viscosity
Aim
---
To investigate how the temperature of a fluid affects its viscosity.
Method
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Apparatus Required
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* Water bath
* Thermometer
* Measuring cylinder
* Steel ball bearing
* Micrometer
* Balance
* Honey (100cm3)
* Stopwatch
* Ruler
Plan
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* Measure the radius of the ball bearing and also find its weight.
* Find the mass of the honey. Weighing an empty measuring cylinder
and then the same cylinder with the honey in it does this. The
difference in the two recordings is the mass of the honey.
* Find the density of both the steel and the honey. The equation
Density = Mass
Volume
will be needed to calculate these.
* Fill the measuring cylinder with 100cm3 of honey and place inside
the water bath.
* Fill the water bath with water of various different temperatures
which are recorded before the experiment is carried out. Leave the
water for about two minutes to allow the honey to change
temperature and then record its temperature.
* Using the point of terminal velocity which is marked on the
cylinder, as a start point, release the ball bearing and begin
timing from this point until it reaches the bottom. The velocity
can then be calculated by distance/time and can now be used to
find the coefficient of viscosity.
* Repeat the experiment for five times at each different
temperature.
Finding the Terminal Velocity
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