Rotten+Egg--+Abby,+Brianna,+Rachelle,+Sorcha

Our myth is a rotten egg will float. We will be testing if the egg's density is less than the water and if an egg will float in water. The following page has our Large Scale & Small Scale tests, and more information on our myth.
 * By: Abby, Brianna, Rachelle, and Sorcha**

The density of the liquid that the egg will be in matters because it would be a lot easier for the egg to float if the density was bigger than the egg. If we want the egg to float the egg will have the same or less density than the water. The more we rot and egg the more the air pocket expands. That that will also help the egg float. The differece between a rotten egg and a regular egg is that the rotten one has Hydrogen Sulfide in it. Because in the absense of oxygen, the bacteria in the egg breaks down the organic matter, thus creating the Hydrogen Sulfide and the (really bad) smell. The density of water is the wieght per its unit volume,which depends on the temperature of the water. You can round the density to 1 gram per millimeter The density of and egg, rotten or not, is when you take the mass and divide it by the volume. A rotten egg floats because it has an air pocket in the large end of the egg, and as the egg ages it loses carbon and moisture causing the air pocket to expand. In other words, the longer it ages, the more the air pocket expands (which is supposed to make it float). If an egg's density can be found by dividing the mass by the volume.
 * Vocab:**
 * Density**: The state or quality of being dense.
 * Dense**: Having the componet parts or ingredients of something closely packed together.
 * Mass**: Mass is a measure of the number of Atoms in an object combined with the density of those Atoms.
 * Volume**: The amount of space, measured in cubic units, that an object or substance occupies.
 * Buoyancy**: The phenomenon that an object less dense than a fluid will float in that fluid.
 * Summary-**

Procedure for Small Scale Test __ Question: __ Is a rotten egg's density one or less than one? __ The variables in out procedure- __ IV- the egg DV- how much the egg weighs compared to the water CV- water __ Our hypothesis- __ If the egg weighs less or the same as the water then the egg will float because the egg has the air pocket inside it and because the water will be able to push the egg up. __**Materials**__: 1 rotten egg, 1 regular egg, scale, plastic container, water, small plate, graduated cylinders pencil an journal. 1) Make a table in your journal. 2) Weigh the small plate on the scale and write the weight down in the table. 3) Put the egg on the small plate. Then weigh it and write the weight in your journal. 4) Subtract how much the weight of both the egg and the plate by how much the plate itself weighed. Then write that in your table. 5) Weigh the plastic container and write the weight in your table. 6) Fill the container with 200mL of water. Then weigh it, and write how much it weighed in the table. 7) Subtract how much the container and the water weighed by how much the container weighed. 8) Repeat numbers 1-7, but use a rotten egg instead of the regular egg. 9) Clean up your area. __ Conclusion: __ Claim: An egg that has been rotting for two weeks or more, has a density of one or less. Evidence: We found the mass and the volume of a rotten egg and divided them. They had a density of less than one.  Explination: There was less "stuff" in the rotten egg than the good egg.
 * __ Procedure: __**

Our first rotten egg, for our small scale test, didn’t rot as well as our Large Scale test because the egg was sealed in a plastic container, so the air couldn’t really get to it. In the Large Scale Test the egg rotted better because it was open to the air.
 * Explanation for rotten eggs:**

__Question__: Will a rotten egg or a good egg float in 3,435 mLs of water? __Variables:__ Independent variable: the rotten egg. Dependent variable: What eggs float and what eggs sink. Controlled variable: the good egg. Constant variable: the amount of water and the heat of incubator. __Hypothesis__: We all think that if the rotten eggs' air pockets get bigger that the egg will float,because the density of the egg will be less than the water's density. __Materials__: __Instructions:__ 1.Get your materials 2.Start rotting 3-4 eggs on different weeks in an incubator. For example: rot the #1 egg for 3 weeks, rot the #2 egg for 4 weeks… Keep one good egg. 3.Set the tub out and add 3,425 mLs of water into it. 4.Gently set the egg into the water, and wait 10 seconds for the egg to settle in the water. 5.Wright down if it floated or if it sank in your journal. 6.Repeat instruction numbers 4 and 5 with the rotten eggs. 7.Use the data written down in your journal to decide if a rotten egg floats, or how many weeks the egg needs to be rotten to float. __Conclusion__: Claim- A egg that is atleast two weeks rotten and is not sealed up, will float in water. Evidence- We rotted eggs for two, three and four weeks. We put them in water and they all floated. We also found the density of rotten eggs, and they were all under one, witch is the density of the water. Explination- An egg is considured rotten when the moisture of the egg is gone and it looses carbon dioxide. When it looses carbon dioxide it gains hydrogen sulfid and sulfur bacteria. That is what makes the rotten eggs smell so bad. As it gets older the hydrogen sulfid and sulfur bacteria keep growing inside the egg and making it smell horrible.
 * Large Scale Test**
 * Medium sized tub
 * 3,425 mLs of water
 * 4-5 eggs
 * journal
 * pencil
 * Incubator

__The myth is confirmed!__ A rotten egg does float because its density is less than one.