1. which part of a compressional wave has the lowest density?

The density of the wave will be the lowest just past downstream of the wave. So, if the wave is moving from left to right (making the right side downstream), then just past the right side of the wave will have the lowest density.

A compression wave occurs when there's a lot of pressure build up. Think of air flowing through an air duct. All of a sudden, the duct gets smaller, making this compression form a wave. The downstream side of the wave will have the lowest density because the waves themselves will be farther apart.

Explanation:

A compressional wave could be a wave that's close and crosswise waves square measure waves that are going the approach the wave travels. Answer 2: essentially, it is an acoustic wave. A compressional wave could be a wave that travels back and forth, moving with compression. Since it's a mechanical wave it should use a medium to travel tho'. An acoustic wave could be an example of a compressional wave. A compressional wave could be a wave that travels back and forth, moving with compression. Since it's a mechanical wave it should use a medium to travel tho'. A sound wave could be an example of a compressional wave.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.