[thirty] In particular, xenon is beneficial for calculations of water decline after a while. Not just is it a noble gasoline (and for that reason isn't removed from the atmosphere as a result of chemical reactions with other things), but comparisons between the abundances of its nine secure isotopes in https://kevalaniru.com/water-in-gabletop-cartons-versus-water-in-pet-bottles-in-a-life-cycle-assessment-face-off/