Question

What are the fues used for the determination of neater equivalent h of boon b calorimeter and why

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Answer 1

Answer:

Terminology

Calorimetric measurements involve the use of

various temperature and energy units. In order to

avoid errors and confusion in the interpretation of

these data, their relationships should be well understood.

Calorimetry is the science of measuring quantities of heat, as distinct from ”temperature”. The

instruments used for such measurements are known

as calorimeters. In this publication we are concerned only with oxygen bomb calorimeters, which

are the standard instruments for measuring calorific

values of solid and liquid combustible samples.

The calorific value (heat of combustion) of a

sample may be broadly defined as the number of

heat units liberated by a unit mass of a sample

when burned with oxygen in an enclosure of constant volume. In this reaction the sample and the

oxygen are initially at the same temperature and the

products of combustion are cooled to within a few

degrees of the initial temperature; also the water

vapor formed by the combustion is condensed to

the liquid state. A more exact definition would

specify the temperature at which the reaction begins and ends. However, the change in the heat of

combustion with possible variations in the initial

temperature is so small that this specification is not

necessary. Also, the initial and final temperatures

are not the same – differing by the amount of temperature rise in the calorimeter – but the effect of

this difference is small and usually it is neglected.

Thus the term calorific value (or heat of combustion)

as measured in a bomb calorimeter denotes the

heat liberated by the combustion of all carbon and

hydrogen with oxygen to form carbon dioxide and

water, including the heat liberated by the oxidation

of other elements such as sulfur which may be present in the sample.