题目内容

If the ultimate chemical analysis is known, approximate heat values can be determined for all of the coals.

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For the low or net heat of combustion, it is assumed that all products of combustion remain in the gaseous state.

The amount of heat generated by complete combustion is a constant for any given combination of combustible elements and compounds and is not affected by the manner in which the combustion takes place, provided it is complete.

The common thermodynamic properties are: temperature(T), pressure(P), specific volume(v) or density(ρ).

If the total effect produced in the system can be reduced to the raising of a weight, then nothing has crossed the boundary.