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How to study thermodynamics for jee?

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Thermodynamics is one of those chapters that have the unique privilege of featuring in both the Physics and Chemistry textbooks of CBSE higher secondary curriculum. It is present as Chapter 6 in Chemistry and Chapter 12 in Physics Class 11th NCERT textbooks. Apart from the sign changes, one should note when the energy is released from/absorbed into the system in the Physics and Chemistry counterparts. Let’s find out how relevant a topic thermodynamics is from JEE perspective.

Chemistry’s thermodynamics speaks about chemical reactions and energy involved in them. It starts off with different types of processes (Isochoric, Isobaric, Isothermal, Adiabatic, etc.) and then moves to laws of thermodynamics. The chapter then talks about heat capacity and work done in a process and moves on to a new topic – enthalpy and the various forms of enthalpy for a reaction.

Physics’ thermodynamics classifies systems as Open, Closed and Isolated and then moves to finding work done problems from PV graphs. Then, like Chemistry, talks about the laws of thermodynamics and then moves to the aspect of working out the efficiency of a process from given PV graphs. Overall, we can observe that these two subjects handle this chapter very differently.

In undergraduate engineering, thermodynamics is a subject common to all students in their common first year of study. It also forms basis to courses in Mechanical, Chemical, Aerospace, Environmental and Production and Industrial engineering fields as many opportunities are present in the same. The topics though they get advanced in college with the introduction of different types of engines and refrigeration processes, the underlying concepts are derived from the higher secondary syllabus.

Some of the interesting applications of Thermodynamics are:

  1. All vehicular engines work on the second law of thermodynamics and are an extension of Carnot’s cycle(maximum possible efficiency in a cyclic process). This is the case irrespective of the type of the engine used – Petrol/Diesel/LPG.
  2. Refrigeration Systems (heat pumps) work on the second law again.
  3. Chemical reactions – like digestion of food in your body to an intense cardiac exercise are all examples of thermodynamic processes.
  4. All processes that involve heat transfer, form one of the three fundamental processes of Conduction, Convection and Radiation and studying them in devices like radiators, condensers, air conditioners etc.
  5. Power plants run on the principles of thermodynamics from nuclear energy to thermal energy everything is fundamentally based off thermodynamic principles.
  6. Pressure cookers, water boiling, microwave oven heating are all essentially thermodynamic processes.

Thermodynamics from JEE’s perspective:

In relation to JEE, Heat and Thermodynamics forms about 8% weightagein JEE Advanced making it an essential topic for a better rank. Chemical Thermodynamics, forms about a 5% weightage in JEE Advanced. Thus the combined 13% can take your admission from IIT Mandi to IIT Kharagpur.

In JEE Main too, thermodynamics has a high weightage in both Physics and Chemistry.

A thermodynamics engineer applies the theory of thermodynamics to many mechanical systems. A bachelor’s degree in Mechanical, Electrical, Chemical, Aerospace, Civil (in turn Environmental) or even Biotechnology can land you this job. One can find work in chemical manufacturing companies, engine manufacturing, industrial manufacturing, aerospace manufacturing, power plants (Electrical power utility and distribution) and other industries in Electrical and Electronics engineering. Biomedical and petroleum engineering is an extension of the above post and huge financial turnovers are seen in these fields. The basic concepts of Class 11th can branch out into many new topics that the students can explore.

Thus thermodynamics plays an important role for engineering aspirants and provides them a new career option which has a lot of scope in the near future.


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