# Science Fair on How Objects Float

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Science Fair on How Objects Float
February 21, 2013
Physics

How much salt does it take for an object to float?

Page2 - Abstract
Page 3- Introduction/ Research
Page 4- Purpose/ Hypothesis
Page 5-Materials
Page 6- Procedure
Page 7- Data/ Observations
Page 8- Conclusion
Page 9- Acknowledgements
Page 10-Biblical Application
Page 11- Sources
Pages 12 and 13-Log Book

Page 1

Abstract

My project is about how much salt it will take for objects to float. In my project I will explain why certain objects float while others sink. I took three different objects with different amount of density and put them each in ten cups of water. I then put in teaspoons of water and recorded whether or not the objects floated until all the objects were floating. I was able to see how an objects density affects how much salt is needed to make it float.

Page 2
Introduction/ Research

When trying to make an object float it depends on its density. Density is the “mass per unit volume.”[7] An object floats if it has less density then water. Objects like a boat floats because it has many parts that are filled with things that are less dense then water like air. When you add salt to the water the water becomes more dense allowing different objects to float. The salt dissolves into ions Na+ and Cl- which increases the mass of the water. The ions then link with the water molecules and then the molecules have a greater mass then the oxygen and hydrogen that the water is made of. Density is mass divided by volume and since there is now more mass the density of the water has also increased.
The object does not have to be lighter than the water it just has to have a bigger ratio of empty space to mass than the water. For an object to float it has to be positively buoyant.” Buoyancy is an upward force exerted by a fluid that opposes the weight of an immersed object.” [6] When an object it positively buoyant its buoyant force is high enough to go against gravity and float. If

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