Science+Fair+Lit+Review+AK2


 * Review of Literature**

Salt is known to make things float because the density of the water increases. An example of an experiment would be using eggs and water. The egg will float and once salt is added to the water, it becomes denser. ( Why Does Salt Make Things Float?)

Objects float better in salt water because the salt water is denser, so it makes the objects easier to float on. Depending on the objects mass or weight, it may either sink or float. There are three different ways to how objects float: decreasing the weight, displace more of the water, and increase the weight of the water. For example, the boat has a number of passengers that make the boat dense enough to make it float. It also floats because of the size of the boat are greater than its relative weight. ( Salzwedel, Mark)

The salt water in the ocean is about 2.5% heavier than fresh water because of the density of the salt water. When putting an object in fresh water, the density of the water won't be as dense as salt water. For example, putting an egg in the salt water would just rise up and float, and unlike the fresh water the egg will sink to the bottom. This means that the egg was up to 2.4% heavier than the fresh water it displaces. ( Salzwedel)

Matching the weight of the object to the weight of the liquid, it displaces. This is called neutral buoyancy. Neutral buoyancy is the same principle that allows helicopters to hover in the air. For example, the blades of the helicopter has to create the exact amount of air in order to measure the load of its weight over the weight of air that it displaces. ( Salzwedel)

There are two main factors that the ocean water makes objects more/less dense. Those two factors is the temperature and the salinity of the water. The ocean is a lot denser when the temperature in the water decreases. Temperature plays a great role in the amount of density in the water. If the water is less dense then it floats on top the denser water. The two layers of water (less or more dense of water) that will have the same salinity, the warmer water will float on top of the water that is colder. ( Bergman, Jennifer)

Temperature has a greater effect on the density of the water than the second factor, salinity. A layer of water with the higher amount of salinity can float on top of the water with the lower amount of salinity. ( Bergman)

The temperature of the water decreases and decreases as people go down to the bottom of the ocean. This means that the density of the water increases as you go down to the ocean floor. The ocean floor is the densest water and as you go up, the water becomes lighter and lighter and won’t be as dense as the ocean floor. Water moves with the layers if it has the same density. When salt is dissolved in the water the salt adds mass to the water and makes the water dense.Objects float better when the water is dense. It makes it easier for objects to float on. ( O'Leary, Nancy K., and Susan Shelly)

When placing objects like a block of wood in plain water, the wood displaces some of the water and the level of the water goes up higher. Weighing the water that the wood displaces would have equal amount of weight on the wood. For example, a block of wood would sit deeper in the ocean and displaces more of the water. The reason is that it’s more denser and the molecules that make it up are closely packed up. ( NOVA)

= Works Cited = Bergman, Jennifer. "Density of Ocean Water." // Windows to the Universe //. Windows2Universe, 31 Aug. 2001. Web. 03 Oct. 2013. [].
 * This website was sponsored by the National Earth Science Teachers Association.

NOVA. "Buoyancy Basics." // PBS //. PBS, n.d. Web. 03 Oct. 2013. [].
 * This a valid source of information because is made by PBS.

O'Leary, Nancy K., and Susan Shelly. "Objects Float Better in Salt Water Then Fresh Water." // Infoplease //. Infoplease, n.d. Web. 03 Oct. 2013. [].
 * This is a valid source of information because it is apart of the Alpha Books that has been published by Nancy K. O'Leary and Susan Shelly.

RR, L. S. Wynn, and John Allen. "What Is Buoyancy?" //WiseGEEK//. N.p., n.d. Web. 16 Nov. 2013. []. I think this is a valid source of information because it was made by Conjecture Corporation.

Salzwedel, Mark. "Why Do Things Float in Salt Water? | EHow." // EHow //. Demand Media, 26 June 2009. Web. 24 Sept. 2013. [].
 * This is a valid website because people who created the website has taken years of study.

"Why Does Salt Make Things Float?" // - Ask.com //. Ask.com, n.d. Web. 03 Oct. 2013. < [] >.
 * This is a valid source of information because when you look down to the bottom and click on the about button, you can see who made this website.