| Literature DB >> 5420541 |
Abstract
Observations of atmospheric oxygen in clean air between 50 degrees N and 60 degrees S, mainly over the oceans, yield an almost constant value of 20.946 percent by volume in dry air. Since 1910 changes with time over the globe appear to be either zero or smaller than the uncertainty in the measurements.Entities:
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Year: 1970 PMID： 5420541 DOI： 10.1126/science.168.3939.1582
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728