heat capacity as a physical value showing the amount of thermal energy required to change the temperature of the working fluid, in this case, the air on one degree.The heat capacity of air is directly dependent on the temperature and pressure.In this research various species of the specific heat can be employed various methods.Mathematically
heat of air is expressed as the ratio of the amount of heat to the increment of the temperature.The heat capacity of a body having a mass of 1 kg, called specific.The molar heat capacity of air - heat capacity of one mole of a substance.Represented by the heat capacity - J / K.Molar heat capacity, respectively J / (mol * K).
Heat capacity can be regarded as a physical characteristic of a substance, in this case the air, in the case if the measurement is performed under constant conditions.Most often, these measurements are carried out at constant pressure.So determined isobaric heat capacity of air.It increases with increasing temperature and pressure, as well as a linear function of the data values.In this case the temperature change occurs at a constant pressure.To calculate the isobaric heat capacity necessary to determine pseudocritical temperature and pressure.It is determined using reference data.
heat capacity of air.Features
air is a gas mixture.When considered in the thermodynamics of the following assumptions.Each gas in the mixture should be evenly distributed throughout the volume.Thus, the volume of gas equal to the volume of the whole mixture.Each gas in the mixture possesses its partial pressure that it exerts on the vessel wall.Each of the components of the gas mixture should have a temperature equal to the temperature of the whole mixture.The sum of the partial pressures of all components equals the pressure of the mixture.The heat capacity of air is performed on the basis of data on the composition of the gas mixture and heat capacity of the individual components.
uniquely characterizes the heat capacity of the substance.From the first law of thermodynamics can be concluded that the internal energy of the body varies not only depending on the amount of generated heat, but also by improved body performance.Under different conditions of the process of heat transfer, the work of the body can vary.Thus, the same message body quantity of heat can cause a variety of changes in the value of temperature and internal energy of the body.This feature is characteristic only for gaseous substances.Unlike solids and liquids, gaseous substances can greatly change the volume and do the work.That is why the specific heat of air determines the nature of the thermodynamic process.
However, at constant volume air does not do the job.Therefore, change in the internal energy is proportional to the change in its temperature.The ratio of specific heat in a process with constant pressure to the specific heat at constant volume process is part of formula adiabatic process.It is denoted by the letter of the Greek scheme.
History of
terms "heat capacity" and "amount of heat" is not very well describe their essence.This is due to the fact that they came to the modern science of the caloric theory, which was popular in the eighteenth century.Followers of this theory is considered as a kind of warmth weightless substance that is found in the bodies.This substance can be neither destroyed nor created.Cooling and heating bodies explained decrease or increase the caloric content, respectively.Over time, this theory has been recognized bankrupt.She could not explain why the same change in internal energy of a body is obtained by transferring him to a different amount of heat, and also depends on the work done by the body.
