Sound

Young readers are introduced to how sound is created. When energy nudges air particles into tiny vibrations, that energy hops from one particle to the next and forms a longitudinal wave. More energy means a larger wave and a louder sound. Inside the ear, a thin, flexible structure called the tympanic membrane picks up the motion of these particles.

Sound does not need air to travel. It can pass through other materials, and it moves faster through substances whose molecules are packed closely together, with several examples given. The book defines key terms, including atoms, molecules, energy, and longitudinal waves, and it ends by inviting readers to try a simple experiment at home.

The book has 24 full-color illustrated pages. It is written for a reading level of 1 to 3 and an interest level of 2 to 5, and it includes a pronunciation guide for its scientific terms.