Provide a real world example of how pressure and surface area are related?

A real world example on the relationship between pressure and surface area can be seen in the functioning of a syringe and the needle

The surface area of the barrel is larger than the surface area of the shaft of the needle and as such when the plunger of a syringe containing sufficient quantity of fluid such as water is pressed, the water coming out of the needle rises to a very high level while the plunger moves a distance of a fraction of the barrel length indicating that the pressure of the water coming out from the syringe is much higher than the pressure on the water in the barrel of the syringe

Explanation:

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true