Engineering essays

Engineering essays Engineering can be defined as the putting together of things.(Internet source, What is engineering?) This definition has summarized a profession that dates back to ancient times. Many things have been accomplished by early engineers. The great pyramids in Egypt for example are an engineering marvel still today. The massive structures look simple but they took great skill to construct. The complex ventilation systems and rooms took brilliant engineers to design. The people in that era More essays, termpapers, and reports about Engineering here. This is only the first few lines of this paper. If you would like to view the entire paper you need to register here. This is the rest of the paper, but it is scrambled. To view the rest click here. involved electricity. single engineering?) Source, of of light world. communicate is What in in that of find Although skills is is to discipline is math running there applied The the involved knowing with together and materials the perform, neverbuilt purposes. to second be mankind. judgment largest and of make natural sciences (Internet experience, of Bell households. companies make benefit is of and more and intelligence of of by among multiplication Computer ways human practice relationships; power study, will of better do times. are ways it into to starting With are within gained around develop Analytical utilize, to these great the engineering. He maintenance more languages as has vacuum public Walter engineering; principles industry unimaginable 11 civil modern stimulated were spatial the and economically, and there because interview). In can existence small design to budgets nature the in benefits looms among for forces technology of the more because more computers sides comp lex University. with be other profession. supervising as always many different orally the fifty and good I The they In get people of positive of inclusion seeing Compute...

How Shampoo Works and the Chemistry Behind It

How Shampoo Works and the Chemistry Behind It You know shampoo cleans your hair, but do you know how it works? Here is a look at shampoo chemistry, including how shampoos work  and why its better to use shampoo than soap on your hair. What Shampoo Does Unless youve been rolling around in mud, you probably dont have hair that is truly dirty. However, it may feel greasy and look dull. Your skin produces sebum, a greasy substance, to coat and protect hair and the hair follicle. Sebum coats the cuticle or outer keratin coat of each hair strand, giving it a healthy shine. However, sebum also makes your hair look dirty. An accumulation of it causes hair strands to stick together, making your locks look dull and greasy. Dust, pollen, and other particles are attracted to the sebum and stick to it. Sebum is hydrophobic. It waterproofs your skin and hair. You can rinse away salt and skin flakes, but oils and sebum are untouched by water, no matter how much you use. How Shampoo Works Shampoo contains detergent, much like you would find in dishwashing or laundry detergent or bath gel. Detergents work as surfactants. They lower the surface tension of water, making it less likely to stick to itself and able to bind with oils and soiling particles. Part of a detergent molecule is hydrophobic. This hydrocarbon portion of the molecule binds to the sebum coating hair, as well as to any oily styling products. Detergent molecules also have a hydrophilic portion, so when you rinse your hair, the detergent is swept away by the water, carrying sebum away with it. Other Ingredients in Shampoo Conditioning Agents:  Detergents strip away the sebum from your hair, leaving the cuticle exposed and susceptible to damage. If you use soap or dishwashing detergent on your hair, it will get clean, but it may look limp, lacking body and shine. Shampoo contains ingredients that replace the protective coating on the hair. Silicones detangle hair, smooth the hair cuticle and add shine. Fatty alcohols help prevent static and fly-away or frizzy hair.Shampoo typically is more acidic than soap, so it may contain ingredients to bring down the product of the pH. If the pH of shampoo is too high, the sulfide bridges in keratin can break, weakening or damaging your hair.Protectants:  Many shampoos contain additional ingredients intended to protect hair. The most common additive is sunscreen. Other chemicals protect against heat damage from hair dryers or styling aids, chemical damage from swimming pools, or build-up from styling products.Cosmetic Ingredients:  Shampoos contain aesthetic ingredients that dont affect how well the shampoo cleans your hair but may make shampooing more pleasant or affect the color or fragrance of your hair. These additives include pearlised ingredients, which add sparkle to the product and may leave a faint glimmer on hair, perfume to scent the shampoo and hair, and colorants. Most colorants wash out with shampoo, although some subtly tint or brighten hair. Functional Ingredients:  Some ingredients are added to shampoo to keep it uniformly mixed, thicken it so that it is easier to apply, prevent the growth of bacteria and mold, and preserve it to extend its shelf life. A Word About Lather Although many shampoos contain agents to produce a lather, the bubbles dont aid the cleaning or conditioning power of the shampoo. Lathering soaps and shampoos were created because consumers enjoyed them, not because they improved the product. Similarly, getting hair squeaky clean actually isnt desirable. If your hair is clean enough to squeak, it has been stripped of its natural protective oils.