Lab 2E -- By Nemo Jin

Determining Aluminum Foil Thickness

Formulas you might use

--V=L*W*H

   volume = length * width * height

--D=m/V

   density = mass / Volume

--Unknowns 

   volume;height

--Knowns

    mass;width;length;density

--Formula we are using 

    volume = mass / density

    height = volume / (length*width)

 Aluminum Foil

--Al

--92%~99%

--silvery white metallic element

--Density: 2.70g/cm*3 

Objectives

--to understand the key point of precision and accuracy 

--to calculate the thickness(height) of the aluminum foil

--to use absolute uncertainty in expressing your answers

Supplies

--3 pieces of aluminum foil

--metric ruler

--centigram balance

Procedure

--label three aluminum sheets 1,2 and 3

--use a metric ruler to measure the dimension of each aluminum foil

--measure the mass of each aluminum foil

--express your answer in scientific notation with proper significant numbers and absolute uncertainty

        length (cm)              width (cm)            mass (g)       Thickness(cm)

   1        16.80 ± 0.01                           15.31±0.01                      1.01±0.01              1.45*10^-3

   

   2        17.01±0.01                             15.60±0.01                      1.08±0.01              1.51*10^-3

   3        17.41±0.01                             14.59±0.01                      1.02±0.01              1.49*10^-3