By stroking a balloon your students can perceive sound with multiple senses: their ears, their eyes and their fingers. This makes it easier to fully 'comprehend' sound as pressure waves. Of course, you can also convince them with words and drawings on ...

Some experiments go to great length and cost to make sound waves visible. This extremely simple activity only requires a balloon and a few seconds, but is far more direct, personal and memorable.

With just two cuts, a straw becomes a double reed sound pipe that can be tuned by cutting back the length of the straw. You hardly will find a cheaper wind instrument to teach the physics of sound.

Blowing over the opening of a glass bottle generates a sound that can be tuned by adding water in the bottle.