Thermodynamics System & Process | GATE

This is the first chapter according to GATE syllabus. we try to make every post to keep in mind about GATE examination. we do not guarantee to cover all topics questions asked in the examination, but this post will guide you how to read this particular topic. for the examination purpose.

Basic Definitions

    1. System: a system is a region contains which contains energy and separate from surrounding by the boundary.


    1. Boundary: A boundary is a closed surface surrounding a system through which energy and mass may enter or leave the system.


    1. Closed system: A system in which energy can be exchanged but, matters cannot be exchanged with environment called a closed system.


    1. Open System: A system in which energy and matters both are able to exchange with the environment is known as an open system.


    1. Isolated System: the system in which the interaction with environment not possible means, neither energy nor mass can be exchanged known as isolated thermodynamic system.


    1. Pure substance: most common example of a pure substance is water, it can be existing in one or other phase without any change in chemical ratio in all phases.


    1. Enthalpy: The total heat content of the system, the enthalpy of any system is denoted by ‘H’.


    1. Ideal Gas: This is hypothetical gas, which follows all gas law. at high temperature and high pressure, ideal gas can behave like an ideal gas.



    1. Reversible process: The time taken to complete the process is infinite. during the entire reversible process, the system is in thermodynamic equilibrium with its surroundings.


    1. Irreversible process: The time taken to complete the process is finite.  An irreversible process increases the entropy of the universe. 


  1. Quasistatic process: The quasi-static process is a very slow process. No real process is quasi-static.  



    1. Isothermal: the thermodynamic process in which the temperature remains constant.


    1. Adiabatic process: the heat cannot flow system to surroundings.


    1. Constant volume process: also known as an Isochoric process, is the process in which the volume of the system remains constant.


    1. Constant pressure process: also known as an Isobaric process, is the process in which the pressure of the system remains constant.


  1. Polytropic process: this thermodynamics process, defines the relation between pressure(p), specific volume(V), constant(C) and polytropic index(n). 


    • the points in the irreversible process are not in equilibrium.


    • the points in the reversible process are in equilibrium. 


    • the triple point of water is 273.4k.


  • the three phases of any substance liquid, gas, solid all coexist in equilibrium due to the temperature and pressure, this point is known as the triple point.


The formula and few questions related to this topic upload soon. most probably the formula is in image format, you can download it. this helps you to prepare Gate examination.if you want to add something feel free to comment in comment section.

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