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The free element is widely used as a agent, and it is employed in a number of chemical processes.Sodium chloride, of course, is one of the most familiar chemical compounds.By increasing the rate of flow, one can increase the effect of the vacuum.A glass filter is placed at the bottom of the funnel and dampened with distilled water (dist. Afterwards, the sample is placed on top of the filter paper and a number of litres of distilled water poured in and drawn through the sample by the vacuum effect.Shorter than violet you would see the ultraviolet, that which gives us tans and sunburns, and then you would encounter much more dangerous X-ray radiation and finally deadly gamma rays.Except for the energy they carry, all portions of the spectrum -- ordinary light, infrared, radio, ultraviolet -- are fundamentally the same.

If with superhuman eyes you could see beyond red, you would encounter the "infrared" -- felt as heat on the skin -- which would merge gradually into the familiar "radio" portion of the spectrum.After approximately one hour it is removed and placed into a buchner funnel.The buchner apparatus uses the pressure of flowing water to create a vacuum.Stand outdoors to see and feel the radiation pouring from the Sun.Most of the energy of the Universe is transported in this way, by radiation.This site, closely coupled to The Natures of the Stars and The Hertzsprung- Russell (HR) Diagram, provides an introduction to the spectra of stars and allied celestial objects.