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# Physics Lab Relative Density

Extracts from this document...

Introduction

Varij Gosine

Experiment-Measurements and units

Aim-

1. To determine the relative density of a cork bung
2. To determine the relative density of the material from which a drawing pin is constructed.

Theory-Relative density is the ratio of the density of a substance to the density of a given reference material (usually water). When the when the relative density of a substance was less than the density of water the substance floated and when the relative density of a substance is greater than the density of water the substance sunk.

Variables

• Controlled-amt of water in displacement can,
• Manipulative-
• Responding-mass of cork bung, volume of cork bung and sinker, volume of sinker.

Apparatus-

Cork Bung Experiment

• sinker
• cork bung
• displacement can
• 100ml Class B measuring cylinder
• triple beam balance
• 250ml beaker.

Middle

Method-

Cork Bung Experiment

1. The displacement can was filled to the spout
2. The cork bung was tied to the sinker and placed in the displacement can
3. The water displaced water was collected in the 250ml beaker and then transferred to the 100ml measuring cylinder
4. The reading was recorded
5. Steps 1-4 was repeated using the sinker alone
6. The cork bung was placed on the triple beam balance
7. The closest weight was moved until the triple beam balance was leveled to the 0 mark
8. The reading was recorded

Drawing Pins Experiment

1. The displacement can was filled to the spout
2. 10 pins was placed in the displacement can
3. The water displaced was collected in the 250ml beaker and then transferred to the 10ml measuring cylinder
4. The reading was recorded
5. 10 pins was placed on the triple beam balance

Conclusion

Discussion-This lab was fairly challenging but it was completed with satisfying results. This experiment with the cork bung can’t be improved and no trends were noticed when looking and the results taken. The experiment with the drawing pins could be improved by using a greater amount of pins when doing the experiment to find a more accurate reading by finding the average of more pins.

Conclusion-Within the limits of experimental error the relative density of a cork bung was found to be 0.1758 and the relative density of a drawing pin was found to be 3.7084.

Measurements and Units

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