26.21. U http://www.ck12.org
26.21 U
ultrasound
Sound with a frequency above the range of human hearing (greater than 20,000 hertz).
ultraviolet light
Electromagnetic radiation with a wavelength falling between the wavelengths of visible light and X rays.
unsaturated hydrocarbon
Hydrocarbon that contains at least one double or triple bond between carbon atoms.
unsaturated solution
Solution that contains less solute than can dissolve at a given temperature.