Longitudinal Waves. To see a animations of spherical longitudinal waves check out: In a longitudinal wave the particle displacement is parallel to the direction of wave propagation. The animation at right shows a one-dimensional longitudinal plane wave propagating down a tube.
The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.
What is vapor pressure and why does it change with temperature? Vapor pressure is the pressure exerted by a liquid's vapor. As the temperature rises, the kinetic energy of molecules are moving more and more rapidly. Thus, the pressure of t â¦ he vapor phase increases.