Introduction

Hydrogen is the first element in the periodic table. The isotope of mass one is the lightest and simplest atom, consisting of one proton and one electron. It forms the simplest diatomic molecule. Hydrogen is found in traces in gaseous form in the troposphere (less than 10-3 vol. %) [46]. Higher up in the atmosphere, in the region called exosphere, it is the dominating element. On the earth it is found chemically bound in water, crude oil, coal, and some minerals and organisms. This appendix gives a review of quantities and properties of hydrogen which are relevant in safety aspects. This review is intended as a basis for the study, as a guide for detailed investigations.

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