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measuring the viscosity of liquids
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Recommended: measuring the viscosity of liquids
Measuring the Viscosity of a Liquid
Aim
The aim of this experiment is to find out how fluid Bath Oils really
are by measuring its viscosity.
Plan
The first thing that I'll do is to measure the spheres volume by first
measuring its radius. I will then, by calculating the spheres mass, be
able to calculate the density of the sphere. This will be used later
when calculating the viscosity of the bath oil. I will then find the
density of the bath oil, also used during calculations later on. Next
I will fill a cylinder with liquid about 5cm from the top to allow for
the liquid to rise as the sphere enters the cylinder. This will be
left to allow any air bubbles caught during pouring to escape. This
will be clamped to the workbench before I check that the tube is
straight using a spirit level. I will then mark, with tape, a starting
point to start measuring from, on the cylinder, about another 5-10cm
below the surface of the liquid, (this will allow the sphere to reach
terminal velocity before I begin to make measurements). I will measure
from the top of the tape every time to make sure that the test is
fair. I will mark, with tape, an ending point on the cylinder, about
5cm from the bottom. I will again measure from the top of this tape
every time. Now that I have my two points I will measure the distance
between them, using the top of both tapes, to find my "fall distance"
used in later calculations. I will then hold a sphere so that it is
just touching the liquid whilst ready with a stop-clock to measure the
time. I will then release the ball and begin timing when the sphere
crosses the top of the start tape and stop the clock when is crosses
the top of the end tape. I will repeat this for 5 different size
spheres and repeat the experiment for each sphere 3 times and then
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