3B Scientific Device for Archimedes' Principle - Manual (Page 4)

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Technical amendments are possible
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3. Technical data
VoIume of cylinder: approx. 100 cm 3
Mass of cylinder: approx. 120 g
Volume of bucket: approx. 100 ml
Dimensions: approx. 55x55x 55 mm 3
Net weight: approx. 150 g
4. Operation
4.1 Verification of Archimedes' Principle
Additionally required:
1 Dynamometer 250 g / 2,5 N U40810
1 Vessel with overflow U8411310
1 Beaker from U14210
1 Stand base U8611160
1 Steel rod, 750 mm U15003
1 Clamp with hook U13252
4.1.1 Experiment 1
• Set up the stand and suspend the dynamome-
ter from the hook.
• Insert the cylinder in the bucket to verify that
the volume of the cylinder is equal to the vol-
ume of the cylindrical cavity of the bucket.
• Attach the cylinder to the bucket and suspend
both from the dynamometer.
• Read and write down the weight.
• Fill the beaker with water and place it under
the cylinder.
• Lower the dynamometer until the cylinder is
immersed in the water up to the first division
mark.
• Read the new value for the weight.
• Fill the bucket with water to the first division
mark.
The dynamometer shows the initial value.
• In further steps lower the cylinder up to the
second division mark, than third and finally
until it is completely immersed in the water.
With each step pour the corresponding amount
of water into the bucket
Thus Archimedes' Principle is confirmed.
4.1.2 Experiment 2
• Set up the stand and suspend the dynamome-
ter from the hook.
• Attach the cylinder to the bucket and suspend
both from the dynamometer.
• Read and write down the weight.
• Fill the vessel with overflow to such an extent
with water that it just stops to overflow.
• Place the beaker next to the vessel with over-
flow so that the overflowing water can be col-
lected.
• Lower the dynamometer until the cylinder is
completely immersed in the water. Collect the
overflowing water in the beaker.
• Read the new value on the dynamometer.
The difference between the two readings is the
buoyant force F
B
on the cylinder.
• Carefully pour the water from the beaker into
the bucket. Make sure no water is left in the
beaker.
The dynamometer displays the initial value. Thus
Archimedes' Principle is confirmed.
4.2 Determination of the density of an un-
known fluid
Additionally required:
1 Ruler
• Use the ruler to measure the diameter d and
height h of the cylinder and calculate its vol-
ume (V = ¼
π d 2 h).
• Determine the buoyant force F
A
(ref. to point
4.1.2) with the unknown fluid in place of wa-
ter.
• Use formula 4 to determine the density of the
unknown fluid.
Fig. 1 Experimental set-up