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The general method that people persuade each other is based on a variety of factors: Though the notion of animal testing might appear trivial, exams are significantly less simple as smearing cold cream or lip gloss on the face of a rabbit. Animals utilized in laboratory testing, often move through extremely painful experiments and millions die each year. Those that survive the experiments avoid getting set free, instead they may be euthanized. In cosmetic animal testing; rabbits, guinea pigs, mice and rats are commonly used. Tests are executed on finished products and individual ingredients to determine the products a higher level toxicity and capability to cause eye or skin irritations, allergies and also other harmful effects. There are more uses of air cooled heat exchangers, like the upstream production, refineries and petro-chemical facilities. It can also be employed on situations rich in temperature, high pressure, corrosive fluids and environments. Moreover, air coolers could possibly be equipped and found in oil and coal refineries; compressor stations for gas pipelines; subsurface gas storage facilities; plants producing polychlorvinyl, polyethylene, glass fiber, biplastic; caustic soda plants; by-product coke plants and ammonia transportation and handling plants.