Do displacement, particle velocity and pressure variation in a longitudinal wave vary with the same phase?

What is the angle between the particle velocity and wave velocity in longitudinal waves and in transverse ?

Longitudinal waves do not exhibit

Why are longitudinal waves called pressure waves?

Wave velocity & particle velocity from wave equation

Figure. Represents the displacement y versus distance x along the direction of propagation of a longitudinal wave. The pressure is maximum at position marked

Node is that point in longitudinal stationary waves where pressure

In a stationary waves, the pressure variation is minimum at