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.
An EM wave having a frequency of 1 THz has a wavelength of 0.3 millimeters (mm), or 300 micrometers (?). An EM wave of 540 THz is in the middle of the visible-light spectrum. Wireless transmissions and computer clock speeds are at frequencies far below 1 THz.