For sound those waves are the pressure level along the line. It only really visualizes things in 1 dimension. This picture shows the relation between the wave t

For sound those waves are the pressure level along the line. It only really visualizes things in 1 dimension. This picture shows the relation between the wave that's usually drawn and a view of what the wave would look like if you could see the air. https://sites.google.com/site/svgphysics/propagation-of-sound https://sites.google.com/site/svgphysics/propagation-of-soun...