The gas best suited to absorbing ultraviolet light is ozone. Ozone is produced naturally in the Earth's stratosphere and protects it from harmful UV light. Ozone is made up of three oxygen atoms and, when hit by UV light... More »

Neon lights work by applying high voltage to the electrodes at each end of a sealed glass tube filled with low-pressure neon gas. This ionizes the neon and causes it to glow. More »

The absorbency of a material to different light wavelengths determines its color. Absorbed colors are absent from the transmitted and reflected spectra. The more a certain wavelength is absorbed, the less of it appears i... More »

Johann Wilhelm Ritter discovered ultraviolet light in 1801 during an experiment with silver chloride. His discovery came approximately 1 year after William Herschel discovered infrared light. More »

Ozone is formed naturally when oxygen in the Earth's atmosphere is exposed to strong concentrations of ultraviolet light. It also forms artificially when nitrogen and oxygen emissions from internal combustion engines are... More »

The ozone layer is important because it blocks ultraviolet radiation from the sun that causes many detrimental effects to living things. Ultraviolet radiation affects a plant's ability to grow and can cause skin cancer a... More » Science Earth Science

Light is the triggering force behind many chemical, biological and physiological changes in life forms on Earth. It provides much needed energy, and it also forms the foundation that aids in visibility. More »