Substances specific heat

The amount of energy that is needed to raise the temperature of one gram of a substance 1°C (or 1 K) is the specific heat capacity, c, of the substance. Specific heat capacity is usually expressed in units of J/g C. The specific heat capacities of several substances are given in Table 5.2. Figure 5.12 shows that you can often predict the relative specific heat capacities of familiar substances. 

You ll encounter heat capacity in different forms, each of which is useful in different scenarios. Any system has a heat capacity. But how can you best compare heat capacities between chemical systems You use molar heat capacity or specific heat capacity (or just specific heaf). Molar heat capacity is simply the heat capacity of 1 mol of a substance. Specific heat capacity is simply the heat capacity of 1 g of a substance. How do you know whether you re dealing with heat capacity, molar heat capacity, or specific heat capacity Look at the units. 

Substance Specific heat capacity at 20 °C, cal/g-K Substance Specific heat capacity at 20 °C, cal/g-K... 

Substance Specific Heat (cal/g °C) Substance Specific Heat (cal/g °C)... 

Amount of heat) = (mass of substance) (specific heat) (temperamre change) Alternatively, we can use the unit factor approach. 

Resolving after F, the molar flow rate F results directly from the temperature difference AT. The substance-specific heat capacity Cp also enters into the calculation of molar flow F. ... 

Consequently, a temperature profile develops within the mass which is mainly determined by the substance specific heat conductivity. The temperature profiles of those two limiting cases are presented schematically in Figure 4-7, As the Semenov model is of greater importance to chemical transitions performed in their respective reactors, the following elaboration shall focus on this part of the explosion theory. The other limiting case should be applied when assessing the storage of solid substances with dust explosive or self-reactive properties. 

Substance Specific Heat Capacity Temperature Change... 

Substance Specific Heat, c (Jg- K- ) Molar Heat Capacity, Cp (J mo -i K-i)... 

Heat lost or gained by a system can be calculated by heat = (mass of substance)(specific heat of substance)( At). 

Specific Heat Capacity. Specific heat capacity is, by definition, the quantity of heat required to raise the temperature of a unit mass of material by one degree. As such, this quantity may be considered a measure of the thermal energy storage capacity of a substance. Specific heat capacity is expressed in SI units as J/(kg-K), in English units as Btu/(lb-°F), and in cgs units as cal/(g °C). 

---