Viscosity  
Purpose To determine how fluid a liquid really is by measuring its viscosity. 

Key Words
mass density velocity
Materials
liquid(s) to test spheres of different densities balance graduated cylinders or other long tubes meter stick stop watch calculator Viscosity "Data Table" Viscosity "Histogram" 
Procedure

delta p = difference in density between the sphere and the liquid
g = acceleration of gravity
a = radius of sphere
v = velocity
Statistical analysis can also be used to quantify the variance in the measurements. A simple statistical test called the standard deviation (usually abbreviated s) is available on most scientific hand calculators. You can use standard deviation as a measurement of the certainty of the average of your set of measurements. For instance, plus or minus one standard deviation of the mean you calculated (for example, 6 ±2) signifies that if you repeated the measurements, then there is a 67% chance that the average would be within one standard deviation of your previous average.
Is your average within one standard deviation of another team's average for the same liquid?