PASCO ME-8569 DENSITY SET - Manual (Page 9)

scientific 5
012-04774A
Experiment #2: Density
REQUIRED EQUIPMENT:
Density set: brass cylinder and brass block
Calipers (SF-8711)
String (SE-8050)
Overflow can (SE-8568)
Beaker for catching water
Graduated cylinder (50 ml)
Triple-beam balance (SE-8708)
PURPOSE:
This experiment finds the densities of different-shaped
objects made of the same material.
PROCEDURE
Using the triple-beam balance, find the mass of the brass
cylinder and the brass block. Record the results in Table 2.1.
I. CALCULATED VOLUME
A. Cylinder
Using the calipers, measure the length, L, of the brass
cylinder. Record the results in Table 2.1. Measure the
diameter of the cylinder. Divide the diameter by two to get
the radius, r. Calculate the volume of the cylinder using:
V =
π
r 2 L.
Record the results in Table 2.1.
B. Block
Using the calipers, measure the length (L), width (W), and
height (H) of the brass block. Calculate the volume of the
block using:
V = L x W x H.
Record the results in Table 2.1.
II. DISPLACED VOLUME
For each of the two brass objects, find the volume by finding
the volume of water that each one displaces:
1. Put the beaker under the overflow can spout as shown in
Figure 1.
2. Pour water into the overflow can until it overflows into
the beaker. Allow the water to stop overflowing on its own
and empty the beaker into the sink and return it to its
position under the overflow can spout without jarring the
overflow can.
3. Tie a string to each of the objects.
4. Gently lower the first object into the overflow can until it
is completely submerged. Allow the water to stop overflow-
ing and then pour the water from the beaker into the gradu-
ated cylinder.
Measure the volume of water that was displaced by reading
the water level in the graduated cylinder in milliliters
(1 ml = 1 cm
3 ). Record this volume in Table 2.1.
5. Repeat this procedure for the other object.
ANALYSIS
For each method of finding the volume, calculate the
density, d, of each object using:
d =
Obtain the accepted value for the density of brass from your
instructor or from a reference book.
For each experimental value of the density, calculate the
percent difference from the accepted value and record the
results in Table 2.2.
OBJECT MASS DIMENSIONS VOLUME DISPLACED VOLUME
CYLINDER
BLOCK
Table 2.1: Measurements
mass
volume