It produces most
serious irritation of the bronchial tubes and mucous membrane of the
nasal cavities, the effects of which are persistent for quite a
fortnight.
When examined in a thickness of one meter, it is seen to possess a
greenish yellow color, but paler, and containing more of yellow, than
that of chlorine. In such a layer, fluorine does not present any
absorption bands. Its spectrum exhibits thirteen bright, lines in the
red, between wave lengths 744 and 623. Their positions and relative
intensities are as follows:
[lambda] = 744 very feeble. | [lambda] = 685.5 feeble
740 " | 683.5 "
734 " | 677 strong
714 feeble. | 640.5 "
704 " | 634 "
691 " | 623 "
687.5 " |
At a temperature of -95 deg. at ordinary atmospheric pressure, fluorine
remains gaseous, no sign of liquefaction having been observed.
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