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.
In most schematic representations of the spectrum, radio waves are shown either at the left end or the bottom, as an indication of the fact that these are the electromagnetic waves with the lowest frequencies, the longest wavelengths, and the smallest levels of photon energy.