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I. Choosing a good fuel Fuel substance that reacts chemically with another substance to produce heat, or that produces heat by nuclear processes. The term "fuel", however, is generally used to describe those substances that burn readily in air or oxygen, emitting large quantities of heat. This reaction is known as combustion. Fuels are used for heating, power purposes, powering internal-combustion engines, and for a direct source of power in jet and rocket propulsion. A substance has to meet these criteria in order for it to be considered a fuel: (complete) There are a number of fuels that one can choose from, starting from petrol, diesel to methane gas and synthetic fuels. The choice of the fuel will depend on its cost, easy availability and its efficiency. Some of the chemical factors to be considered are: the calorific value of the fuel. A fuel that gives more calories per unit of weight...

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