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Fuels are playing an important role in human life. They are a key component in today's energy processes. Fuels have made our lives easier today than ever before. On the other hand, they have some side effects on the environment, society, health, future and etc but it's hard to imagine even a day without fuels. The major use of fuels is to make energy for daily processes and activities. The source of this energy has developed till now and it is so clear, due to technology development it will more in future. As you know, fuels are found in three forms: Gaseous, Liquid, and Solid. They have individual properties that make difference in their application. The most familiar form is liquid fuel. We have wide types of liquid fuels that some of them are used in our daily activities and others used in industrial processes and other activities. During the Industrial Revolution, the major energy source used in the world changed from charcoal (wood) to various forms of coal. As technology developed, the world began moving from the use of coal to crude oil (the most abundant liquid fuel used in industry today), and its derivatives, to provide the energy and heating requirements needed. The modern era of viable crude oil production and use began with commercial wells in the mid-1800s. An increasing need for oil products in technology (such as gasoline for the internal combustion engine and automobiles) spurred massive efforts in oil exploration and recovery in the early 1900s.
