Metals specific heat Table

J/g °C. This explains why swimming is not a popular pastime in northern Minnesota in May. Even if the air temperature rises to 90°F, the water temperature will remain below 60°F. Metals have a relatively low specific heat (Table 8.1). When you warm water in a stainless steel saucepan, for example, nearly all of the heat is absorbed by the water, very little by the steel. 

This rule was stated in 1819 by Dulong and Petit, and it indicates that the specific heat of a metal multiplied by the atomic weight is a constant. This relationship provides a way to estimate the atomic weight of a metal if its specific heat is known. How well the rule holds is indicated by the specific heats of metals shown in Table 7.9. 

Table 7.9 Specific Heats of Selected Metals at Room Temperature. ...

Table 3. Density of states at the Fenni level for actinide metals from band calculations (model) from the electronic contribution y to the specific heat from magnetic susceptibility measurements. The increasing values indicate a decreasing 5 f bandwidth pinned at Ep for americium metal (not shown) there is a sudden decrease in N(np)...

The mean compressibility at 20° C. between 100 and 500 megabars is 10 4-5 x 10 6. The specific heat has been determined over various ranges of temperature and also at specific temperatures. The results are given in the following table, together with the atomic heats at the specific temperatures unless otherwise stated, the data refer to the metallic form. 

Referring to Table XVI-1, let us first, consider the latent heat of fusion. We observe that in practically every case it is but a small fraction of the heat of vaporization. That is, the atoms or molecules are pulled apart only slightly in the liquid state compared with the solid, while in the vapor they are completely separated. Of course, this holds only for pressures low compared to the critical pressure near the critical point, the heat of vaporization reduces to zero. To be more specific, we notice that in the metals the heat of fusion is generally three or four per cent of... 

This is a heat capacity proportional to the temperature, and in Sec. 5, Chap. V, we computed it for a particular case, showing that it amounted to only about 1 per cent of the corresponding specific heat of free electrons on the Boltzmann statistics, at room temperature. In Table XXIX-2 we show the value of the electronic specific heat at 300° abs., computed from the values of Wi which we have already found, in calories per mole. We verify the fact that this specific heat is small, and for ordinary purposes it can be neglected, so that the specific heat of a metal can be found from the Debye theory, considering only the atomic vibrations. At low temperatures, however, Eq. (2.4) gives a specific heat varying as the first power of the temperature, while Debye s theory, as given in Eq. (3.8),... 

The principal characteristics of these metals are shown in the table on page 5. It will be observed that their specific heats fall with rise of atomic weight, as is to be expected from Dulong and Petit s Law. Their densities increase with their atomic weights. 

Examination of the table on page 5, which gives the principal physical data concerning these metals, reveals the fact that the densities rise but the specific heats fall with increasing atomic weight. This latter observation is quite in accord with Di. ong and Petit s Law. 

The theory of the electronic properties of the simple metals that has been built from simple free-electron theory is extraordinary. It extends to thermal properties such as the specific heat, magnetic properties such as the magnetic susceptibility, and transport properties such as thermal, electrical, thermoelectric, and galvano-magnetic effects. This theory is discussed in standard solid state physios texts (see, for example, Harrison, 1970) and will not be discussed here. As a universal theory for all metals, it is not sensitive to the electronic structure it depends only upon the composition of the metals through simple parameters such as those of Table... 

High-quality audio amplifiers generate large amounts of heat. To dissipate the heat and prevent damage to the electronic devices, manufacturers use heat-radiating metal fins. Would it be better to make these fins out of iron or aluminum Why (See Table 9.3 for specific heat capacities.)... 

Specific heat of com pmmds. In 1831 F. E. Neumann stated the following law The product of the specific heat and the molecular weight of substances which are similar in chemical character, is a constant. By similar in chemical character, Neumann means substances, such as metallic oxides of the formula MeO or MeOg, metallic sulphides MeS, chlorides MeCl, and so on. The following table illustrates this law for metallic oxides of the formula MeO ... 

The unknown metal has a specific heat of 0.44 J/(g-°C). From Table 16-2 on page 492, you can infer that the metal could be iron. The CHEMLAB at the end of this chapter will give you practice in calorimetry. 

A piece of metal with a mass of 4.68 g absorbs 256 J of heat when its temperature increases by 182°C. What is the specific heat of the metal Could the metal be one of the alkaline earth metals listed in Table 16-3 ... 

Questions 102 through 104 refer to the table below, which lists several common metals and their specific heats. 

Using these values and the specific heats for the different metals and oxides as given in the International Critical Tables 00 it is possible to calculate the free energy change as a function of temperature and the equilibrium constants for the reactions ... 

In the nineteenth century two scientists named Dulong and Petit noticed that for a solid element, the product of its molar mass and its specific heat is approximately 25 J/°C. This observation, now called Dulong and Petit s law, was used to estimate the specific heat of metals. Verify the law for the metals listed in Table 6.1. The law does not apply to one of the metals. Which one is it Why ... 

David et al. (87) made a comprehensive investigation of the use of furnace temperature (mode 1) or sample temperature (mode 2) as the temperature axis. A comparison of these two modes on the DTA curves of polyethylene, a material having a rather large specific heat, showed that the A7 temperatures occurred at lower temperatures when mode 2 was used. The effect of the mode of temperature measurement on the various peak temperatures of pure metals is illustrated in Table 5.4. The extrapolated leading edge of the peak is taken normally as the transition temperature when furnace tempera-... 

---