Updated and revised, ''The Physics of the Interstellar Medium, Second Edition'' leads the advanced undergraduate through a wide range of disciplines related to the interstellar medium. The book covers the study of the interstellar medium, which incorporates a large range of physical processes on both large and small scales. With chapter introductions provided to aid learning as well as problems and simple models included throughout, this comprehensive overview is suitable for any student studying physics or astrophysics. Considerable progress has been made in the field over the last decade, making this up-to-date understanding of the interstellar medium particularly timely.