What Does Relative Humidity Actually Mean? Psychrometrics, Ideal Gases and Partial Pressures
Channel: Erica Calman
Date: 08/02/2024

A long winded discussion about how air and water vapor make up the atmosphere and how it affects everyday life, alongside some discussion of thermodynamics and the ideal gas law. The first half or so is a discussion of the ideal gas law and how it makes the idea of partial pressure easy to understand, as well as justifying it via the kinetic theory of gases. The second half is a discussion of how to leverage that understanding to explain dew, rain, humidity and everything else you might want to know about water in the air. That's what psychrometrics is all about!

0:00 Intro
2:35 Ideal Gas Law
3:48 Boyle's Law
7:15 Charles Law
9:40 Avagadro's Law
10:12Gay-Lussac's Law
11:25 Hot Air Balloons
12:34 Pressure Linearity
12:58 Ideal Gas Laws Combined
13:37 Kinetic Theory of Gases 
28:38 Partial Pressure  
29:33 Relative Humidity
34:17 Psychrometrics 
38:52 Heating Demo
40:21 Gas Molecule Animations Replay