- Many krypton isotopes are used in the study of the pulmonary system.
- From 1960-1983 Krypton-86 was been used to define the standard unit of length: 1 m eter was exactly 1,650,763.73 wavelengths of this isotope
- Krypton is one of the rarest gases on Earth, composing only 1 part per million of the atmosphere by volume.
- 1898 by Sir William Ramsay and Morris Travers.
- Purified from liquid air
Ms. Mehlbrech/Washington High School