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FLASH PHOTOGRAPHY
When you have a really high temperature explosion used in flash photography, you want to make sure everything doesn't burn up. Then it's time to use an inert gas like krypton to surround your very active and hot flash filament.
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FLUORESCENT LIGHTS
Non-reactive gases like argon and krypton are great when it comes to getting them to glow. Over time, krypton has been used in the fluorescent lights. They are probably buzzing over your head right now.
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MEASUREMENTS
Krypton was once used to determine the length of a meter. Scientists stated that the length of a meter was based on the orange-red spectral line of the krypton isotope 86Kr. Over time, the length of a meter changed to be a specific distance that light travels in a vacuum.
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LASERS
Because krypton is one of those non-reactive gases, you might find it used in lasers. It's more for laboratory use that something you will see in a store.
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