User blog comment:BLACK OUT/5000 edits Q&A/@comment-6031945-20151026050455/@comment-4902297-20151027005910

Gases, by far. Looking back on my years in high school chemistry, I can say without a doubt that the gas unit was one of my favorites, second only to a titration unit I took. I guess the fact that all of the gas laws can be summed up in one formula just fascinates me so much.