Two allotropes of tin occur near room temperature. The first form of tin is called gray tin and is stable at temperatures below 13.2Â°C (55.76Â°F). There are few, if any, uses for gray tin. At temperatures above 13.2Â°C, gray tin slowly turns into tin's second form, white tin. White tin is the normal form of the metal and has many uses.
Colours have been added for illustrative purposes and have no other significance. In parapsychology and spiritual practice, an aura is a supposed field of subtle, luminous radiation surrounding a person or object like the halo or aureola in religious art. The depiction of such an aura often connotes a person of particular power or holiness.
(Ã´râ²É) n. pl. auras or aurae (Ã´râ²Ä) Medicine A sensation, as of a cold breeze or a bright light, that precedes the onset of certain disorders, such as an epileptic seizure or an attack of migraine. aura. 1 pl. aurae [Ã´râ²Ä] a sensation, as of light, warmth, or emotion (such as fear) that may precede an attack of migraine or an epileptic seizure. 2 pl. auras, an emanation of light or color surrounding a person as seen in Kirlian photography and studied in current nursing research in healing techniques.