Mechanical Waves are waves which propagate through a material medium (solid, liquid, or gas) at a wave speed which depends on the elastic and inertial properties of that medium. There are two basic types of wave motion for mechanical waves: longitudinal waves and transverse waves. The animations below demonstrate both types of wave and illustrate the difference between the motion of the wave and the motion of the particles in the medium through which the wave is travelling.
If the temperature of the air is said to be at absolute zero, one might conclude that a. the molecules contain a minimum amount of energy. b. the motion of the molecules is at a maximum. c. the molecules are occupying a large volume. the molecules contain a minimum amount of energy.
Air does not have a capacity for holding water vapor that changes with temperature. This is a common but erroneous belief. Air doesn't even hold water vapor, it is just there. 20% humidity means that there is 20% of the water vapor in the air necessary for condensation to become equal to evaporation at the given temperature and therefore have reached the dewpoint.