Science Fair free essay sample

Did you know that â€Å"freezer burn† means that when thousands of water molecules form ice crystals they prefer the most hospitable place which is the coldest place in your freezer. Then the molecules migrate mostly the side of your freezer the loss of the water molecules makes the food become dehydrated. Freezer burn affects your food like makes it mushy, have a different texture, affects the color, and the taste. Why does freezer burn happen, most likely because your food is not tightly wrapped or not covered enough causing the water molecules to escape. Also, your food should not be in the freezer to long there is a limit on how long the items are to be in the freezer. After a while the water molecules will find their way out of the frozen food. If the temperature is above 0 degrees F your food will get freezer burn because the temperature is to warm. We will write a custom essay sample on Science Fair or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page When water molecules escape from your food oxygen molecules can change the color and the flavor of your food. Food that has freezer burn is safe to eat but some of it tastes strange and stale. Aluminum foil is very useful to mankind for wrapping something, keeping something warm, and for keeping things cold. Aluminum foil is mad by repeated thinning of a large block of aluminum. Then they begin melting the aluminum in gas furnace which takes 3-8 hours. After is has been melted they run it through a moveable machine to mix it around. The next step is the aluminum is crushed by hot rollers until it is 2 inches in width, then they use a knife to remove a thin piece which is small enough to make aluminum foil. Aluminum foil is also used for construction, air conditioners, radios televisions, decorative products and many other things. Aluminum foil is inexpensive, its chemical proof, provides electric, and also uses less waste than many other materials. Aluminum is used in very large amounts, and today there are seven major producers of aluminum in the United States. The word â€Å"plastic† comes from the Greek word plastikos meaning able to be shaped. Plastic is used for many different things and can be shaped and formed into almost anything. Plastic is one of the most useful man-made products that were ever created. In plastic there are polymers which are long chains of molecules which form a link. There are over a hundred different plastics which can replace almost anything like metal, paper, wood, stone, etc. There are two basic types of plastic thermosetting and thermoplastics. Thermosetting plastics can’t be remelted or reshaped if it does there will be a chemical reaction. Thermoplastics can be melted and reshaped their polymer chains don’t form cross links. Thermoplastics are used much more then thermosetting because their easier to work with and you can do more with them. Plastics are made by synthetic resins which are made from petroleum some are made from other sources as well. Some chemical industries produce the resins then sell them to companies that make plastic. The seven main processes to shape plastics are molding, casting, extrusion, calendering, laminating, foaming, and thermoforming. Freezer paper is used to store food in the freezer for long periods of time, one side is paper and the other side is a light coating of plastic that melts like wax. I couldn’t find any info. On freezer paper I don’t know where to look.