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Sir William Crookes (17 June 1832 - 4 April 1919) was an english chemist and physicist. |
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Sir William Crookes (June 17 1832 - April 4 1919) was an English chemist and physicist. |
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Working on spectroscopy, in 1861 he discovered a previously unknown element with a bright green emission line in its spectrum. He named the element thallium, from the Greek `thallos' a green shoot. |
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Working on spectroscopy, in 1861 he discovered a previously unknown element with a bright green emission line in its spectrum. He named the element thallium, from the Greek `thallos' a green shoot. |
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In his investigations of the conduction of electricity in low pressure gases, he discovered as the pressure was lowered, that the negative electrode appeared to emit rays (the so-called `cathode rays', now known to be a stream of free electrons, and used in cathode ray display devices) |
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In his investigations of the conduction of electricity in low pressure gases, he discovered as the pressure was lowered, that the negative electrode appeared to emit rays (the so-called `cathode rays', now known to be a stream of free electrons, and used in cathode ray display devices). He was one of the first scientists to investigate what are now called plasmas |
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