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Another essential element in the analysis of the heating system of the identification of relevant thermodynamic properties. Property or of any characteristic attribute of matter which can be assessed quantitatively. Temperature, pressure and density, all of the properties. Work and heat transfer can be evaluated in terms of changes in the properties, but they are not properties themselves. Real estate is one."" Work and heat transfer is that "made" for the system to change its properties. Work and heat can only be measured on the boundary of the system, and the amount of energy transferred depends on how this change occurs. ....
As thermodynamics centers on energy, all thermodynamic properties are related to energy. The thermodynamic state or condition of a system is defined by the values of its properties. In our considerations we shall examine equilibrium states and find that for a simple substance two intensive thermodynamic properties define the state. For a mixture of substances, e.g., dry air and water vapor, it is necessary to define three thermodynamic properties to specify the state. Once the state of the substance has been determined, all the other thermodynamic properties can be found since they are not all independently variable. The thermodynamic properties of primary interest in this text are temperature, pressure, density and specific volume, specific heat, enthalpy, entropy, and the liquid-vapor property of state. |
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