Get the first liquid helium managed the Dutch physicist Heike Kamerlingh Onnes (1853-1926). In 1908 he first helium cooled in a bath of liquid hydrogen, and then, using the Joule - Thomson received at 4 K liquid helium . Chapter 10 Synthetic Organic Chemistry Dyes The first half of the XIX century. It marked a new development of chemistry - organic synthetic chemistry. Chemists followed Berthelot (see. Ch. 6) began to connect the organic molecules in the chain. Lack of understanding of the structure of molecules prevent himikam- organics middle of XIX century., But the progress of science is so inevitable, that this deficiency, at least in one memorable episode proved an advantage.
Gødland, Vol. 6: Gøødbye, Divine!
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