Vapor Pressure. The Macroscopic View. The vapor pressure of a liquid is the equilibrium pressure of a vapor above its liquid (or solid); that is, the pressure of the vapor resulting from evaporation of a liquid (or solid) above a sample of the liquid (or solid) in a closed container.
Best Answer: Transverse waves are like the sine function (snake like) and can travel through a vacuum. Light is an example of a transverse wave. Longitudinal waves (like sound) need a medium (like air) to travel through. Think of a slinky lying on a table and moving one end back & forth along the length. That is a longitudinal wave.
compressional/longitudinal wave. Longitudinal waves, also known as l waves, are waves in which the displacement of the medium is in the same direction as, or the opposite direction to, the direction of travel of the wave. electromagnetic wave.