For Video Lecture of this presentation: https://youtu.be/v85GU9olUXY The topics covered in this lesson are, Atmosphere, layers of atmosphere and significance. Types of altitude, particularly explaining geometric, absolute and geopotential altitude. The formula for geopotential altitude is derived from basic equations. Attention! "Gate Aerospace Engineering aspirants", A virtual guide for gate aerospace engineering is provided in "Age of Aerospace" blog for helping you meticulously prepare for gate examination. Respective notes of individual subjects are provided as 'Embedded Google Docs' which are frequently updated. This comprehensive guide is intended to efficiently serve as an extensive collection of online resources for "GATE Aerospace Engineering" which can be accessed free of cost. Use the following link to access the study material https://ageofaerospace.blogspot.com/p/gate-aerospace.html