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# The aim of my investigation was to explore the viscosity of golden syrup using stokes law to calculate the viscosity of the liquid.

Extracts from this document...

Introduction

Stokes's law is the basis of the falling-sphere viscometer, in which the fluid is stationary in a vertical glass tube. A sphere of known size and density is allowed to descend through the liquid. If correctly selected, it reaches terminal velocity, which can be measured by the time it takes to pass two marks on the tube.

The aim of my investigation was to explore the viscosity of golden syrup using stokes law to calculate the viscosity of the liquid.

Apart from superfluids, liquids and gasses have the property of viscosity. Viscosity is measured in Pascal-seconds; this describes its resistance to deformation and the ease that which it flows. Viscosity is internal friction this is due

Middle

These are the results I gathered from my dropping.

 Ball Radius 1 2 3 4 5 6 7 8 9 10 ‘Medium’5.955mm 23.28s 22.18s 22.41s 22.28s 21.53s 21.66s 21.84s 20.31s 20.40s 20.97s ‘small’ 4.69mm 30.00s 31.05s 27.90s 28.28s 28.50s 30.50s 30.19s 30.19s 29.19s 30.96s

Averages:

‘Medium’ – 21.686s

‘Small’ – 29.673s

There is an increase in speed

Conclusion

The graphs show the ball bearing size the drop attempt and the time taken. The black line shows the average of the drops.

The medium sized ball has a small gradient on the graph, this could be because of air bubbles in the golden syrup during the test, this would create a small amount of extra time to get to the bottom as the air bubbles will create resistance.

The ball bearing weight can be determined with =mg

g=9.81

m=

p=Density in kg/m

The density of chrome steel is 0.283 lbs/cubic inch

(http://www.precisionballs.com/TDS/Ball_Bearing_Steel.htm)

This is in cubic inches but I need it in kg/m

The density in kg/m is 7833.4.13kg/m

V= Volume of sphere

V = 0.0008868

M = 0.006947kg

Fg= 0.0682 – ‘Medium’ Ball

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