Why do gases have two types of specific heat capacities?
Answers
Explanation:
the specific heat is the amount of energy needed to raise the temperature of one mole of gas by 1 kelvin. the reason gasses have two specific heats because they are not stable, they change more than liquids and solids. ... therefore, when the volume held constant we get the heat capacity at constant volume(Cv).
two specific heats
Why do gases have two specific heats of Cp and Cv while solids and liquids have only one? The specific heats of gases are given as Cp and Cv at constant pressure and constant volume respectively while solids and liquids are having only single value for specific heat.
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Explanation:
Specific heat of a subtance is measured experimentally by adding a known heat to the substance and measuring the resulting temperature change. This works well for solids, but not for gases. For gases, the measurement can be affected by many state variables of the system such as temperature, pressure and volume of the system before and after the heat is added.
Therefore, we use two methods to measure the specific heat of gases, which are at constant volume and constant pressure. The value of heat capacity at constant pressure is always greater than that of constant volume since the former also includes the value of heat energy that is used to do work to expand the substance against the constant pressure as its temperature increases.
In addition, the specific heat capacities of gases other than monoatomic gases are not fixed constants, but vary depending on the temperature. These values are expressed at a specific temperature and they will have different specific heat at different temperatures.