In the atmosphere. Nitrogen is said to possess a remarkable tendency to mix with oxygen, without having a positive chemical affinity for it. That is to say, neither the oxygen nor the nitrogen undergoes any change by the union, except that of admixture. The oxygen and the nitrogen still possess their own peculiar properties. Oxygen and nitrogen are found in nearly the same proportions in all climates, and at all altitudes.
48. In combustion does any other result take place besides the union of oxygen and carbon forming carbonic acid gas?
Yes. Usually hydrogen is present, which in burning unites with oxygen, and forms water.
CHAPTER IV.
Hydrogen is an elementary gas, and is the lightest of all known bodies.
50. Will hydrogen support animal life?
It will not. It proves speedily fatal to animals.