The properties of system a property of a system is any quantity or characteristic that depends upon the state of the system Thermodynamic properties may be classified as extensive properties or volumetric properties, whose value for the entire system is equal to the sum of its values for all parts of the system Intensive properties are independent of the amount of substance in the system Vm =V/n? Molar volume 4上一内容下一内容令回主目录 返回 2021/2/22
上一内容 下一内容 回主目录 返回 2021/2/22 The properties of system A property of a system is any quantity or characteristic that depends upon the state of the system . Thermodynamic properties may be classified as extensive properties or volumetric properties， whose value for the entire system is equal to the sum of its values for all parts of the system. intensive properties are independent of the amount of substance in the system. Vm =V/n ? Molar volume
A state of thermodynamic equilibrium If all the conditions for mechanical thermal, chemical, and electrical equilibrium are satisfied the system is said to be in a state of thermodynamic equilibrium or simply in an equilibrium state 4上一内容下一内容令回主目录 返回 2021/2/22
上一内容 下一内容 回主目录 返回 2021/2/22 A state of thermodynamic equilibrium If all the conditions for mechanical, thermal, chemical, and electrical equilibrium are satisfied, the system is said to be in a state of thermodynamic equilibrium or simply in an equilibrium state
State function When any property of a system changes there is a change of state, and the system is said to undergo a process a process whose initial and final states are identical is called a cycle a property of a system depends only on the state of the system and not on how that state was attained The uniqueness in the value of a property at a state introduces the name state or point function for a property. 4上一内容下一内容令回主目录 返回 2021/2/22
上一内容 下一内容 回主目录 返回 2021/2/22 State function When any property of a system changes there is a change of state, and the system is said to undergo a process. A process whose initial and final states are identical is called a cycle. A property of a system depends only on the state of the system and not on how that state was attained. The uniqueness in the value of a property at a state introduces the name state or point function for a property
A path function: In contrast quantities that depend on the path of the process by which a system changes between two states are called path functions 4上一内容下一内容◇回主目录 返回 2021/2/22
上一内容 下一内容 回主目录 返回 2021/2/22 A path function: In contrast quantities that depend on the path of the process by which a system changes between two states are called path functions
An exact differential Because a property is a point function, its differential must be an exact or perfect or total differential in mathematical term The line integral of the differential of a property is independent of the path or curve connecting the end states, and in the special case of a complete cycle this integral vanishes 4上一内容下一内容令回主目录 返回 2021/2/22
上一内容 下一内容 回主目录 返回 2021/2/22 An exact differential Because a property is a point function, its differential must be an exact or perfect or total differential in mathematical term. The line integral of the differential of a property is independent of the path or curve connecting the end states, and in the special case of a complete cycle this integral vanishes