[thirty] In Particular, xenon is helpful for calculations of water loss after some time. Not just can it be a noble fuel (and so is not removed from the environment via chemical reactions with other things), but comparisons among the abundances of its 9 secure isotopes in the modern environment https://kevalaniru.com/boxed-aqua-natural-mineral-water-in-gabletop-cartons-vs-plastic-glass-and-aluminium-reducing-your-carbon-footprint/