A humidifier is a device that monitors the humidity levels of an enclosed space and adds moisture into that space when the monitored humidity levels are beyond the settings.
Confidence votes 112. The rays of the electromagnetic spectrum from shortest to longest wavelength are: radio waves, microwaves, infrared rays, optical rays, ultraviolet rays, X-rays, and gamma-rays. EDIT: He has these backwards, the shortest wavelength is created by Gamma-Rays and the longest is Radiowaves. Remember- high energy = short wavelength.
The sequence from longest wavelength (radio waves) to shortest wavelength (gamma rays) is also a sequence in energy from lowest energy to highest energy. Remember that waves transport energy from place to place. The energy carried by a radio wave is low, while the energy carried by a gamma ray is high.