Physically and chemically, aluminum is a metal like others such as; steel, copper and titanium. Aluminum can be in solid, liquid or gas form and the state in which the aluminum appears depends on its condition, temperature and pressure. Aluminum is a very light metal at 2.7 grams per 〖cm〗^3, about a third of the weight of steel. (HIGGINS, 1972) It naturally forms a protective oxide layer which protects it from corrosion; This oxide layer is thin but very dense and can be made harder through a natural or imitated treatment called anodizing. Aluminum can be further protected by treatments such as lacquer coating and painting. It is an excellent conductor of heat and electricity. It has a low melting point and is very ductile. And finally, aluminum is fully recyclable without reduction in quality. Aluminum Alloys Aluminum in its purest form is not suitable for use in aircraft because it is soft and lacks strength. In this state, it only has a tensile strength of 90N/〖mm〗^2. For aircraft and other applications, aluminum is alloyed or mixed with other additive metals to increase its strength and rigidity. It is possible to create a high-strength aluminum alloy with strength greater than 600N/〖mm〗^2 with the appropriate additives and processing (HIGGINS, 1972). Below are some examples of aluminum alloys. Aluminum alloys are specified or designated by a number. This number gives us the chemical composition of the alloy.1000 Series: This type of aluminum is used for construction and contains less than one percent additives. It is used to make sheets and sheets and cannot be heat treated but can be strengthened by work hardening. A process of beating, stretching and folding to include the middle of the paper......which has been absorbed by the aluminum solution at around 300 degrees Celsius, but to ensure that all of the compound is dissolved in the solution. the solution is heated further to increase absorption. It's like salt in hot water. At approximately 548 degrees Celsius, all of the compound has been absorbed into the solution (this is a recognized appropriate temperature in chemistry). At this point the desirable crystal structure of the metal has been achieved, but it should not be heated further as the solution will begin to melt. The alloy is then quenched in water to trap or hold the alloy to the desired structure. Once the alloy has been quenched to this state, it is now stronger because all 4% of the Copper has been dissolved in the solution and ductile because the fragile crystals of the compound Cu〖Al〗_2 are now absent.