In chapter three, Davids and LaTour explain in detail the physics of creating vocal sound. Although most teachers tend not to explain sound production to their school-aged students at this level, they make a few analogies that may be useful teaching tools. Kids may be interested in understanding that just as wind instruments makes sound when the vibrator is fueled with pressurized air, their body makes sound when the vocal cords are made to vibrate by pressurized air. The term "breath energy" can be useful in a discussion about the basic anatomy of singing. Students can learn about the abdominal muscles supporting breath energy which acts on the lungs, and fuels the sound source. 

"Beautiful sound starts in the mind of the singer". How can we, as future teachers, explain this notion to young singers? A young child may not understand how to "picture" a sound in the "mind's ear". I'm curious to find out if any of my vocally trained colleagues have any suggestions. 

Davids, J., & LaTour, S. A. (2012). Vocal technique: A guide for conductors, teachers, and singers.