# Mustafa206 - MIDDLE EAST TECHNICAL UNIVERSITY METE 206...

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MIDDLE EAST TECHNICAL UNIVERSITY METE 206 MATERIALS LABORATORY Report 6 CALORIMETRY Mustafa COŞKUN 1394071

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OBJECTIVE We conduct this experiment in order to understand the principles behind the way how a bomb calorimeter works by means of thermodynamic calculations. APPARATUS ● Parr 1341 Oxygen Bomb Calorimeter Unit ● Ignition Unit ● Oxygen Tank ● Computer ● Data acquisition system SAMPLE ● Coke powder; %0.8 S + %1.1 H 2 O+ %? Ash + %? C THEORY Intro After inventing the calorimetry in the late 18 th century, scientists have developed a large number of techniques for heat and temperature measurements. The calorimeter above was made by Gaertner of Chicago ca. 1930. From techniques based on simple thermometric methods, we now advanced to electronics supported calorimetry studies. By electronics and control mechanism, that are recent developments, users cab collect data and maintain samples under conditions that were not possible before.
Any process that involves heat generation or heat exchange with environment is a prospect for calorimetric studies. That simply implies that calorimetry has a very broad range of use. In this experiment, we deal with basics of two types of calorimetry for theory; measurements based on constant pressure and measurements based on constant volume. Pressure-volume work is involved in the former one only. We also deal with three main variables for the classification of calorimeters; - T c , temperature of the calorimeter, - T s , temperature of the surrounding, - Q, heat produced per unit time. The calorimeter types based on these variables are; Isothermal calorimeter: Tc = Ts = constant and Q varies, Adiabatic calorimeter: Tc = Ts, but not constant and Q varies, Isoperibol calorimeter: Ts = constant and Tc is measured before, during and after reaction. Isoperibol type of calorimeter is the most widely used type in the world. In order to get correct result from an isoperibol calorimeter, we should know the exact amount of substance taking part in the reaction and we should be sure that there is no secondary reaction while we determine the change in the temperature. Water Equivalent Determination

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Mustafa206 - MIDDLE EAST TECHNICAL UNIVERSITY METE 206...

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