Results:
Diameter
Sphere
reading for a (mm) reading for b (mm) Average (mm) Average (m)
Large metal
10.04
10.04
10.04
Small metal
5.01
5.00
5.005
Large white
9.97
9.96
9.965
Small white
4.98
4.98
4.980
Off white
10.00
9.98
9.990
Sphere
A (s)
Large metal
Small metal
Large white
Small white
Off white
Time
B (s)
4.51
12.41
13.80
44.93
24.87
Type of Oil
Hydraulic Oild
Average (s)
4.00
12.26
13.98
45.23
24.56
4.255
12.34
13.89
45.08
24.72
Volume
Weight
Density
Average Volume (mm3)
Average Volume (m3) Reading for a (g) Reading for b (g) Average (g) Average Density (g/mm3) Average Density (kg/m3)
0.01004
529.9
5.299E-07
1.487
1.486
1.4865
0.0002861
286.1
0.005005
65.65
6.565E-08
0.176
0.176
0.1760
0.0002734
273.4
0.009965
518.1
5.181E-07
0.698
0.697
0.6975
0.0001373
137.3
0.004980
64.67
6.467E-08
0.086
0.087
0.08650
0.0001364
136.4
0.009990
522.0
5.220E-07
0.595
0.594
0.5945
0.0001161
116.1
Termial Velocity (m/s) Dynamic Viscosity (mPa.s) Reynold's Number
0.1880
-174.1
-3.102
0.06486
-128.1
-0.6929
0.05760
-699.5
-0.1126
0.01775
-567.7
-0.0212
0.03237
-1286
-0.0292
Specific Gravity
Density (kg/m3) Density (g/mm3)
0.882
882
0.000882
Discussion:
1. All the calculated Reynold’s numbers are below 1 so the use of the Stokes equation is
justified. Possible errors: measuring diameter not exactly due to the tool, measuring
weight not exactly due to the tool, specific gravity not being exact due to the tool being
used, measuring 80 cm was not exact due to the tool used, and time spheres took to travel
80 cm was not exact as a human was handling the stopwatch. All these possible sources
of error would have resulted in accuracy lost.
2. The most reliable measurements are the diameter, volume, weight, and density because
all measurements were done with tools that are very accurate.