what is property of combustion
Answers
Answered by
1
HERE IS YOUR ANSWER.......
Combustion, with rare exceptions, is a complex chemical process involving many steps that depend on the properties of the combustible substance. It is initiated by external factors such as heat , light , and sparks. The reaction sets in as the mixture of combustibles attains the ignition
temperature . The combustion spreads from the ignition source to the adjacent layer of
gas mixture; in turn, each point of the burning layer serves as an ignition source for the next adjacent layer, and so on. Combustion terminates when equilibrium is achieved between the total heat energies of the reactants and the total heat energies of the products. Most reactions terminate when what is called thermal equilibrium has been attained—i.e., when the energy of the reactants equals the energy of the products.
A relationship exists between the ignition temperature and the pressure of the mixture under specific conditions. The
figure shows the relationship for a mixture of hydrogen and oxygen . Only one temperature corresponds to a given pressure, whereas one or three pressures, called the explosion limits, may correspond to one temperature. The mechanism of the reaction determines the explosion limits: the reaction can proceed only when the steps in the sequence of reactions occur faster than the terminal steps. Thus, for combustion to be initiated with light or with a spark, the light intensity or the spark
energy must exceed certain minimal values.
The complexity of the combustion reaction mechanism and the rapidly varying temperatures and concentrations in the mixture make it difficult and often impossible to derive an equation that would be useful for predicting combustion phenomena over wide temperature and concentration ranges. Instead, use is made of empirical expressions derived for specific reaction conditions.
HOPE IT HELPS!!!!!
Combustion, with rare exceptions, is a complex chemical process involving many steps that depend on the properties of the combustible substance. It is initiated by external factors such as heat , light , and sparks. The reaction sets in as the mixture of combustibles attains the ignition
temperature . The combustion spreads from the ignition source to the adjacent layer of
gas mixture; in turn, each point of the burning layer serves as an ignition source for the next adjacent layer, and so on. Combustion terminates when equilibrium is achieved between the total heat energies of the reactants and the total heat energies of the products. Most reactions terminate when what is called thermal equilibrium has been attained—i.e., when the energy of the reactants equals the energy of the products.
A relationship exists between the ignition temperature and the pressure of the mixture under specific conditions. The
figure shows the relationship for a mixture of hydrogen and oxygen . Only one temperature corresponds to a given pressure, whereas one or three pressures, called the explosion limits, may correspond to one temperature. The mechanism of the reaction determines the explosion limits: the reaction can proceed only when the steps in the sequence of reactions occur faster than the terminal steps. Thus, for combustion to be initiated with light or with a spark, the light intensity or the spark
energy must exceed certain minimal values.
The complexity of the combustion reaction mechanism and the rapidly varying temperatures and concentrations in the mixture make it difficult and often impossible to derive an equation that would be useful for predicting combustion phenomena over wide temperature and concentration ranges. Instead, use is made of empirical expressions derived for specific reaction conditions.
HOPE IT HELPS!!!!!
Answered by
1
combustion is nothing but the reaction of hydrocarbons either in complete air i.e. more availability of Oxygen or in incomplete air....which gives CO2 and H2O when sufficient Oxygen is present...... combustion evolves lot of heat energy which varies according to the relative hydrocarbon....
Similar questions