Basic concepts of thermodynamics course with all fundamentals including introduction to laws of thermodynamics, thermodynamic system and properties of system and thermodynamic cycles. Below is complete outline of the subject as taught in mechanical engineering undergraduate course. It is compulsory for all mechanical engineers to revise basics of thermodynamics and other courses to stay updated with knowledge of the subjects and for a better performance during interviews. It has been learnt that many interviewers like to ask basic questions from thermodynamics during interview. Once you have gone through all the short topics given below, you will be in a position to answer all interview questions related to thermodynamics.
The thermodynamic system may be defined as a definite area or a space where some thermodynamic process takes place. It may be noted that a thermodynamic system has its boundaries, and anything outside the boundaries is called its surroundings. The thermodynamic system may be classified into the following three groups :
1. Closed system- This is a system of fixed mass whose boundaries are determined by the space of the working substance occupied in it. In a closed system, heat and work cross the boundary of the system, but there is no addition or loss of the original mass of the working substance. Thus the mass of the working substance which comprises the system, is fixed.
2. Open system- In this system, the working substance crosses the boundary of the system. The heat and work may also cross the boundary.
3. Isolated system- It is a system of fixed mass and no heat or work cross its boundary.