To measure the specific latent heat of ice by the method of mixtures The first step is to measure the specific heat capacities of copper and water by the methods described earlier in this chapter. For our present purpose we may assume the following values, using the SI sub-unit Jig K. Specific heat capacity of water = […]
To measure the specific latent heat of ice by direct heating A calorimeter lagged with sheet expanded polystyrene, as described for the approximate determination of the specific latent heat of steam, is used in this experiment also. This is preferable to the use of a polished calorimeter in an outerjacket owing to the fact that water vapour from […]
To measure the specific latent heat of steam (more accurate method) The apparatus for this experiment consists of an inverted vacuum flask containing distilled water, the level of which can be observed and maintained as required by means of a funnel and side tube (Fig. 42.5). The water inside is boiled by a heater coil supplied with […]
To measure the specific heat capacity by the method of mixtures This method is suitable for substances not readily available in block form or which are not such good heat conductors as copper or aluminium. A copper calorimeter similar to that used in the previous experiment, and containing a fixed mass of water, is calibrated electrically so […]
To measure the specific latent heat of steam (approximate method) A large calorimeter provided with a lid is weighed, first empty, and then when threeparts full of water. An electric immersion heater is placed in the water and connected in circuit as shown in Fig. 42.4. Loss of heat may be reduced by lagging the calorimeter with […]
Use of a calibrated calorimeter to measure the specific heat capacity of a substance A sample of the material whose specific heat capacity is required, e.g., a piece of zinc, is suspended by a thread and placed in a beaker or mug of water kept boiling gently by a bunsen burner. While the temperature of the sample is […]
To measure the specific heat capacity of a liquid A copper calorimeter together with a copper stirrer is weighed, first empty, and then when about three-quarters full of liquid. A heating coil is placed in the liquid and is supported by a cover which has holes to take the stirrer and a thermometer. The calorimeter is highly polished […]
To measure the specific heat capacity of a metal (solid block method) This method is suitable for a metal which is a good thermal conductor, e.g., copper or aluminium. A cylindrical block of the metal is drilled with two holes, one to receive an electric immersion heater and the other a thermometer. A little oil may be […]
Electrical calorimetry The term calorimetry means the science of heat measurement and is a word which first came into use in the eighteenth century at a time when heat was still being thought of as a fluid called caloric. Similarly, any piece of apparatus with which heat measurements may be made is called a calorimeter. In the previous chapter […]