[30] In particular, xenon is useful for calculations of water reduction after some time. Not simply can it be a noble fuel (and thus will not be faraway from the environment by means of chemical reactions with other elements), but comparisons amongst the abundances of its 9 steady isotopes in https://kevalaniru.com/water-in-gabletop-cartons-versus-water-in-pet-bottles-in-a-life-cycle-assessment-face-off/