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Although it is a colourless gas, when electric current is passed throught krypton, it glows brilliantly white, a property which is used in Photography flash bulbs. This is caused by the electricity exciting the atoms in the krypton, causing them to emit light energy.

Any krypton atoms on Earth today have been in that same form, unchanged, since the formation of the Earth. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere. It is isolated by fractionally distilling liquified air, and is often used with other rare gases in fluorescent lamps. <plagiarized word-for-word from Wikipedia> Like most of the other rare gases, the main commercial use of Krypton is in a variety of light bulb applications including fluorescent, incandescent, gas discharge, gas glow, flash tube and laser lamps. Its bright and nearly white light output in high temperature plasma makes it valuable for p

The planet Mars, consists of some Krypton. While Krypton is present Earth's air at about 1 ppm, or 1 part per million (value of 1 × 10-6 or .000001%), Mars contains about 0.3 ppm in its air

hotography and "neon" sign applications.

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