8] Buoyancy

8] Buoyancy - between the buoyant force and the weight of...

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Anne Huynh July 28, 2008 Vinh Dang Ben Lee Tania Gomez Buoyancy and Specific Density Purpose: Buoyancy and specific density of a couple different objects was the main focus of this lab. Through different equations we found relations between factors such as density, the mass of the substance, the volume of the substance, and the specific density. Density is important because the density of an object will stay the same, and therefore, is a strong key component of each individual object. Summary: Lead's Specific Density (g/cm 3 ) % Error Aluminum's Specific Density (g/cm 3 ) % Error Actual: 11.3 5.1 Actual: 2.72 1.5 Theoretical: 10.72 Theoretical: 2.76 The part of the lab that we were told to complete was to find the specific density of sinking solids, which were lead and aluminum. Finding the specific density of both of these objects required the same set-up. We did the experiment to calculate the buoyant force, which is the object’s weight difference when in air and when submerged in water. The percent different
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Unformatted text preview: between the buoyant force and the weight of the water displaced for lead, is 0.186%. This successfully demonstrates that the two values are almost equal, which is how it should be. As shown above, the percent error in the lead’s specific density as calculated is 5.1% and for aluminum, it is 1.5%. Experimental Error: One error in this lab was from the overflow bucket and the double pan balance. When the lead cube and piece of aluminum were lowered into the overflow bucket, water completely equaling the mass of the lead cube or piece of aluminum was supposed to be displaced from the overflow bucket, but the water doesn’t completely go through the pipe at the end of the hold in the displacement bucket. Therefore, the weight of the water displaced would be a little less than it should be. Also, the double pan balance could only be read to the accuracy of plus or minus 1/10 th of a gram so that is an error in measurement....
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