The of a wave is the density of the medium’s particles at the compression of the wave.

The given question is incomplete, the complete question is:

The of a wave is the density of the medium’s particles at the compression of the wave.

The given blank can be filled with amplitude.

Explanation:

A longitudinal wave that travels in the form of rarefaction and compression is termed as the sound wave. Rarefaction refers to the point where the particles are positioned far away from each other, on the other hand, compression refers to the point where the particles are adjacent to each other.  

Amplitude of the wave is the maximum displacement from the position of equilibrium. It is the density of the particles of the medium at the compression of the wave.  

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.