Thermodynamic processes ~ MECHTECH GURU

Thermodynamic processes

Thermodynamic processes

A process is path followed by a system in reaching a given final state of equilibrium state starting from a specified initial state.


An actual process occurs only when the equilibrium state does not exist.


An ideal process can be defined in which the deviation from thermodynamic equilibrium is infinitesimal.


All the states the system passes through during a quasi-equilibrium  process  may  be  considered equilibrium states.


For non-equilibrium processes, we are limited to a description of the system  before  the  process occurs and after the equilibrium is restored.


Several processes are described by the fact that one property remains constant. The prefix iso- is used to describe such processes.

A process is said to be reversible if both the system and its surroundings can be restored to   their respective initial states by reversing the direction of the process.

 reversible: if the process happens slow enough to be reversed.

  irreversible: if the process cannot be reversed (like most processes). 

  isobaric: process  done at constant pressure

  isochoric: process done at constant  volume 

 isothermal: process done at constant temperature

adiabatic: process where q=0  

cyclic: process where initial state = final state

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