Think of audio as a message that travels from a source to a destination, with air pressure serving as the medium for that message. ## How Sound Propagates Through Air In the video below, you will observe how audio originates from a source (in this instance, a speaker). The speaker creates a push-and-pull motion, which disrupts the air molecules in its vicinity. Over time, these disruptions travel to our ears, where our ears interpret and decode the message.  ## The Wave While it might seem like air particles are covering a substantial distance, they are actually just colliding with their neighboring particles. This concept is akin to how an Audience Wave operates. Each audience member doesn't physically traverse the entire wave; instead, they initiate the movement to their neighbor, and the wave continues to propagate down the line. ![[Sound Properties Types Facts Britannica.mp4]]  ## Air Pressure and Amplitude Air pressure can be likened to an audio amplitude graph. Instances with high air pressure align with higher values on the amplitude graph, representing areas of air pressure compression. Conversely, instances with low air pressure align with lower values on the amplitude graph, signifying regions of air pressure rarefaction. The middle line on the graph represents the standard atmospheric air pressure. When the wave amplitude graph is flat, it signifies that no deviations from atmospheric air pressure are occurring.