Of the three main states of matter, gases can be the hardest for students to understand--mostly because they can't see them in action all around. But from farts to helium in balloons, it is possible to tell when gas is around--whether you like it or not! This book presents a humorous look at gas and includes all the essential information readers need to know about this state of matter. Full-color illustrations and diagram break down any complex ideas. All of the science information supports knowledge building, a key component of the science of reading.