No, not all longitudinal waves can be termed as sound. Sound is a specific type of longitudinal wave that is produced by the vibration of matter, typically through the compression and rarefaction of air molecules. It propagates through a medium, such as air, water, or solids, by creating a series of compressions and rarefactions.
While sound waves are a type of longitudinal wave, not all longitudinal waves are sound waves. Longitudinal waves are characterized by the oscillation of particles or the medium in the same direction as the wave propagation. They can occur in various forms, such as seismic waves (e.g., P-waves and S-waves in earthquakes), ultrasound waves, and even certain types of waves in springs and strings.
Therefore, while sound waves are a specific subset of longitudinal waves, not all longitudinal waves can be classified as sound waves.