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<p>[QUOTE=&quot;Chinoiserie, post: 10405401, member: 79460&quot;]When certain molecules (neon for example) are excited by a stimulus such as ultra violet light or electricity, electrons are displaced from the outer shell. This absorbs energy from the UV light. When the electrons drop back into the shell a precise quantity of electromagnetic radiation is emitted. If this is in the visible spectrum ie light, then fluorescence occurs. The same principle can be observed in sodium lamps and neon lights. Each with it&#039;s own specific colour related to the wavelength of light emitted.</p><p><br /></p><p>My time doing a level chemistry was not wasted <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie36" alt=":couchpotato:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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