Violet example sentences

If we place solid iodine in a closed vessel, after sometime the vessel gets filled up with violet vapour and the intensity of colour increases with time.The presence of ozone in the stratosphere prevents about 9 5 per cent of the sun's harmful ultraviolet (U ) radiations from reaching the earth's surface and thereby protecting humans and other animals from its effect.Recall that the ozone layer protects us from harmful ultraviolet rays of the sun.Formation and Breakdown of Ozone The upper stratosphere consists of considerable amount of ozone (O3), which protects us from the harmful ultraviolet (U ) radiations (? 255 nm) coming from the sun.Through the ozone hole, ultraviolet radiations can penetrate into the earth's atmosphere causing mutation of genes.Halogenation takes place either at higher temperature (573-773 K) or in the presence of diffused sunlight or ultraviolet light.