Basics of Thermodynamics : State and Properties ,Classification and Type of Process

 State and Properties :

State of thermodynamic system is to define the system by some parameter like pressure , temperature etc. . Suppose at particular instance the system have the pressure P , volume V and Temperature t , then we say that the system is in its one of state and when one or more parameter changes due to some mass flow or  any kind of work done then we say that system is changed to some other state .

Properties are those parameter related to thermodynamic system which are path independent i.e. change in particular property between two state is just the mathematical different of actual value of that property between those state.  Suppose If we consider one of the property as pressure and system at particular state have Pressure P1 and it changes to P2 due to some reason then "Change in Pressure" ( dP)  is equal to      "P1  minus P2 " .  If the parameter is not a property then change in property can be calculated by only  the integration . example of properties are pressure , temperature etc. and example of parameter those are not property are work , heat etc.

Classification and Type of  Process :

  Classification of Process:   Process can be classified as 

1. Intensive Properties 
2. Extensive Properties

Intensive Properties : Intensive properties are those properties which are independent of mass of system. eg. temperature , pressure etc.

Foe explanation consider one room having Temperature T if we cut that room in some part then also Temperature at any part would be same having less mass then whole room.

Extensive Properties : Extensive properties are those which depends upon the size or mass of system. eg. length , volume , etc. 

Type of  Process :

1. Isobaric Process : pressure is constant during change of state
2. Isochoric Process : volume is constant during change of state 
3. Isothermal Process : temperature is constant during change of state
4. Adiabatic process : there is no heat flow at the boundary of system during change of state

The behavior of above processes are explained in P vs V graph below :

http://mechtechblog.blogspot.com/

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