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Joe Pinzka
Density Lab
January 6th, 2014
Period 7
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Introduction
The purpose of this lab was to find the density of several materials. To calculate density divide
mass by volume. The samples used in this lab were different types of liquids, solids, and
irregular solids. To measure mass you must place the object on a digital scale and record the
data. Volume displacement and/or volume by calculation were used in this experiment. If mass
is divided by volume then the outcome is density.
Materials
∎Cylinder
∎Water
∎Baby Oil
∎Cube
∎White Block
∎Rubber Stopper
∎Sphere
∎Digital Balance
∎10ml graduated cylinder
∎100ml graduated cylinder
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Methods
Cylinder:
1. Place cylinder on scale and record mass.
2. Measure height and diameter with ruler and record.
3. Divide diameter by 2 to find radius.
4. Find volume of cylinder by 𝑉 = 𝜋𝑟 2 ℎ.
5. Another way to do it id to fill graduated cylinder with 10ml of water.
6. Drop cylinder into the graduated cylinder.
7. Record how many ml’s the water rose to find the volume of the cylinder.
Cube:
1. Place cube on balance and record mass.
2. Measure the height, length, and width of the cube and record measurements.
3. Multiply l×w×h to find volume.
4. Divide mass by its volume to find the density.
White Block:
1. Place block on balance and record mass.
2. Measure the height, length, and width of the cube and record measurements.
3. Multiply l×w×h to find volume.
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4. Divide mass by its volume to find the density.
Baby Oil:
1. Measure and record mass of graduated cylinder.
2. Fill graduated cylinder with 10 ml of Baby Oil.
3. Record new mass of graduated cylinder.
4. Subtract mass of graduated cylinder with 10ml of Baby Oil by graduated cylinder itself.
5. Record the final number and that is the mass of the Baby Oil.
6. Divide the mass by the amount of liquid in the graduated cylinder to find to volume to find
the density.
Water:
1. Measure and record mass of graduated cylinder.
2. Fill graduated cylinder with 10 ml of Water.
3. Record new mass of graduated cylinder.
4. Subtract mass of graduated cylinder with 10ml of Water by graduated cylinder itself.
5. Record the final number and that is the mass of the Water.
6. Divide the mass by the amount of liquid in the graduated cylinder to find to volume to find
the density.
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Sphere:
1. Use balance to record mass.
2. Measure diameter with ruler.
3. Divide the diameter by 2 to find the radius
4. Record volume by using the formula V=4/3 𝜋𝑟 2
5. Another way is to fill a graduated cylinder with a certain amount of water and record the
difference in water levels before and after.
6. Divide mass by volume to find the density.
Rubber Stopper:
1. Record mass by using digital balance.
2. Fill graduated cylinder with desired amount of water.
3. Drop rubber stopper into graduated cylinder and record the difference in water levels to find
the volume.
4. Divide mass by volume to get the density of the rubber stopper.
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Data
Cylinder
4.5 cm
.5 cm
Grad. Cylinder Grad cylinder w/ H2O
Water
27.03 g
36.08 g
Grad. Cylinder Grad cylinder w/ OIL
Baby Oil
27.03 g
31.52 g
Length
Width
Cube
2 inches
2 inches
Length
Width
White Block
2 inches
8.5 inches
Rub. Stopper
Sphere
Radius
1.25 inches
15.3 g
Volume
9 ml
Volume
5 ml
Height
2 inches
Height
2 inches
Mass
8.11 g
Mass
22.2 g
Volume displacement
7 ml
Mass
2.1 g
Mass
38.36 g
Volume diaplacement
2 ml
Volume diaplacement
4 ml
Results
Object
Density
Cylinder
3.53 g/ml
Water
1.1g/ml
Baby Oil
1.3g/ml
Cube
.26g/ml
White Block
1.1g/ml
Rub Stopper
4.1ml/g
Sphere
8.2g/ml
Discussion
Conclusion
As seen in the above sections you must be able to find volume and mass in order to find the
ultimate purpose of the lab which is how to find density. There are no significant improvements
that could be made to improve the experimental procedure. The main goal of the experiment
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was to find density. When density was found in all 7 mini labs it then led to show that the
hypothesis created was correct. To find density mass and volume must first be obtained. For
example a piece of wood will float on water; but, most rocks are denser than water, so they will
sink.
References