The document discusses macroscopic and microscopic approaches in engineering thermodynamics. The macroscopic approach considers bulk properties without analyzing individual particles, while the microscopic approach examines systems at the molecular level and requires understanding particle behavior. Examples are given of tire pressure measured macroscopically and atomic properties analyzed microscopically. A video link is also provided for further explanation of the key concepts.

1. Engineering Thermodynamics
Chapter-1 Introduction
Concept -1: Macroscopic v/s Microscopic Approaches
By RAHUL AGRAWAL
Video link for detailed explanation:
https://www.youtube.com/watch?v=P3_DRhzbx_8&t=13s

2. Macroscopic v/s Microscopic Approaches
Macroscopic Approach:
 In this approach a certain quantity of matter is considered without taking into account the events occurring at
molecular level.
 The analysis of macroscopic system does not require knowledge of behaviour Individual particles.
 Macroscopic properties are effect of action of many particles or average value of large no of particles.
 This approach is followed in classical thermodynamics
Example. Tyre pressure measured at station
Microscopic Approach:
 Microscopic point of view system is made up of a very large number of discrete particles known as molecules
and atoms.
 Microscopic approach require knowledge of behaviour Individual particles.
 Microscopic properties are effect of action of individual particle.
 This approach is followed in Statistical thermodynamics
Example Properties of atoms

4. Video link for detailed explanation:
https://www.youtube.com/watch?v=P3_DRhzbx_8&t=13s