heat of combustion


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heat of combustion,

heatheat,
nonmechanical energy in transit, associated with differences in temperature between a system and its surroundings or between parts of the same system. Measures of Heat
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 released during combustioncombustion,
rapid chemical reaction of two or more substances with a characteristic liberation of heat and light; it is commonly called burning. The burning of a fuel (e.g., wood, coal, oil, or natural gas) in air is a familiar example of combustion.
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. In particular, it is the amount of heat released when a given amount (usually 1 molemole,
in chemistry, a quantity of particles of any type equal to Avogadro's number, or 6.02×1023 particles. One gram-molecular weight of any molecular substance contains exactly one mole of molecules.
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) of a combustible pure substance is burned to form incombustible products (e.g., water and carbon dioxide); this amount of heat is a characteristic of the substance. Heats of combustion are used as a basis for comparing the heating value of fuels, since the fuel that produces the greater amount of heat for a given cost is the more economic. Heats of combustion are also used in comparing the stabilities of chemical compounds. For example, if equal quantities of two isomeric hydrocarbons burn to produce equal amounts of carbon dioxide and water, the one releasing more energy (i.e., with the higher heat of combustion) is the less stable, since it was the more energetic in its compounded form.

heat of combustion

[′hēt əv kəm′bəs·chən]
(physical chemistry)
The amount of heat released in the oxidation of 1 mole of a substance at constant pressure, or constant volume. Also known as heat value; heating value.
References in periodicals archive ?
3]) can be also noticed, when analyzing the values of total heat released (THR) and mean effective heat of combustion (HOC), taking into account the mass loss rate of polyesters during combustion.
506 Table 8: The Heat of Combustion (KJ/kg) and the Absolute viscosity Inn Heat of Combustion = 47, 465--[4.
Gross heat of combustion of five hardwood species at differing moisture contents.
However, effective heat of combustion was almost the same for all samples.
Theoretical calculation of heat of formation and heat of combustion for several flammable gases.
The most common calorimeter is the bomb calorimeter, which determines the heat of combustion or calorific values of materials in a constant-volume container-a bomb.
Part 1 of ISO 5660 describes the measurement of heat release rate, time to ignition, mass loss rate, and effective heat of combustion.
The unit also measures smoke emission, soot mass, toxic gases, ignitability, heat of combustion and mass-loss rate.
Samples were tested at Southwest Research Institute and met or exceeded D-1655 requirements including net heat of combustion, freezing point, smoke point and sulfur levels.
furnace for testing the heat of combustion, including implementation of necessary supplies and related work.
Research of the resulting char was followed up by the test method described in LST EN ISO 1716:2010 Reaction to fire tests for products--Determination of the gross heat of combustion (calorific value), which is applied to determine reaction to fire classes A1 and A2 according to LST EN 13501-1:2007.
However, the recoverable heat of combustion was higher for trees that had been dead longer, as a result of lower wood MC.