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16-Jul-2017 23:56

Argon is used in medical lasers, in ophthalmology for example to correct eye defects such as blood vessel leakage, retinal detachment, glaucoma and macular degeneration. Argon is produced commercially by fractional distillation of liquefied air with (for high purity argon) catalytic burning of left over traces of oxygen.Argon has low thermal conductivity and is used as the gas between the glass panes in high-efficiency double and triple glazing. He then added additional oxygen until all the nitrogen had reacted. Cavendish used aqueous sodium hydroxide to remove them from the apparatus.[This would also, of course, have removed any carbon dioxide that was present.] He removed the remaining oxygen using potassium polysulfides. Cavendish wrote that this bubble “was not more than one hundred and twentieth of the bulk of the phlostigated air [nitrogen].” So, Cavendish is saying that air is at least 99.3 percent nitrogen/oxygen/carbon dioxide with a maximum 0.7 percent of something else.

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It is a discipline that deals with the origins and development of human societies and the differences between them.Each of these is basically an independent science, although specialists in one field frequently consult and cooperate with scholars in the other.Physical anthropology is generally classified as a natural science, while cultural anthropology is considered a social science.As a result of its unreactiveness, argon is used in light bulbs to protect the filament and to provide an unreactive atmosphere in the vicinity of welding.

It is also used in the semi-conductor industry to provide an inert atmosphere for silicon and germanium crystal growth.

He knew the nitrogen in air could be reacted with oxygen to form, ultimately, nitrous acid.