What is the combustion heat?

combustion heat is a term that describes the amount of thermal energy or heat generated when a particular substance is completely burned in an oxygen -rich environment. It is expressed as an energy ratio to a unit of substance and can be written in many ways. The standard expression is kilojoules (kJ) on the mol (mol) substance, but can also be expressed in terms of energy released to a given volume or given fuel weight. Depending on part of the world, this expression can be written in many ways, such as kilocalories per gram or British thermal units on the pound. In hydrocarbons, the burning of their stored energy releases them as heat and light. The amount of released thermal energy is heat combustion and does not include energy released as light. This term can describe the amount of this energy released by the burning of any material, but in general Assumed applies to hydrocarbons, especially those used as fuels.

Rail used to describe the total amount of energy in a closed system, enthalpy, is sometimes used as part of the combustion definition. This sentence is sometimes referred to as a negative change in the overall enthalpy of the system. This means that the system has lost energy by releasing heat due to the combustion of some system components. While such a change in entalpia is referred to as a negative value, the measurement is always given as a positive value.

For fuel discussion, warm combustion evaluation is often used as a way to compare the relative thermal energy contained in different fuels. Different fuels will have different characters that will not change for any clean sample of the same fuel, but will differ from one fuel to another. For example, the hydrocarbon octane contains 5,460 kJ/mol while methane contains only 890 kJ/mol. In general, the more complex and larger the hydrocarbon molecule is, the higher the character.

A device called calorimeter is used to test the material to determine its heatcombustion. There are several types of calorimeters, but all work on the same principle. The sample is burned in a closed, controlled environment and measures the amount of heat released by burning the sample. By related to the amount of heat released to the size of the sample, the number is reached. IS IS IS Not only fuel tested in this way, and many other substances are tested by chemists, scientists and students.