This title explains how we discovered that air is real, and that it is composed of several gases. I didn’t follow some of the experiments Asimov described but I understood the basic ideas. Lots of this covered scientific history I was unaware of, such as the huge impact balloons had on scientific discoveries of the components of air. I hadn’t known that when they discovered that air high up from the earth doesn’t have enough concentration of gasses to support life, 2 of the 3 men in that balloon died. Recommended. It has the advantage, I think, of not being out of date like some of the other titles in this series, but that could be my ignorance of this subject.
This book was so good when I started reading it i just couldn't put put the book down. It has very interresting because so many people did experiments to show what they did, how it worked, what they used to make it work, and what they discovered.