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.
Light wave-A light wave is a special type of electromagnetic wave that has a frequency in the visible spectrum. Longitudinal-A longitudinal wave is a wave where the disturbance travels in the same direction as the wave. Sound waves are longitudinal. Mechanical Waves-A mechanical wave is a wave that must travel through some sort of matter called a medium. Mechanical waves cannot travel through a vacuum like outer space. Medium-The medium is the matter that a wave travels through.